{"product_id":"eshopps-power-flow-hang-on-overflow-box","title":"Eshopps Power Flow Hang-On Overflow Box","description":"\u003cstyle\u003e\n.aq-pd{font-family:Georgia,serif;color:#1a1a1a;max-width:860px;margin:0 auto;line-height:1.7;}\n.aq-pd h2{font-size:1.45em;font-weight:700;letter-spacing:-0.01em;border-left:4px solid #c0392b;padding-left:12px;margin:2em 0 0.6em;}\n.aq-pd h3{font-size:1.05em;font-weight:700;margin:1.2em 0 0.4em;color:#c0392b;text-transform:uppercase;letter-spacing:0.06em;font-family:Arial,sans-serif;}\n.aq-pd p{margin:0.5em 0 1em;}\n.aq-callout{background:#1a1a1a;color:#fff;border-radius:4px;padding:16px 20px;margin:1.6em 0;font-family:Arial,sans-serif;font-size:0.93em;line-height:1.6;}\n.aq-callout strong{color:#f5c518;}\n.aq-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:1em 0 1.6em;}\n.aq-feature-card{background:#f4f4f4;border-radius:4px;padding:14px 16px;border-left:3px solid #c0392b;font-family:Arial,sans-serif;font-size:0.9em;}\n.aq-feature-card strong{display:block;margin-bottom:3px;color:#1a1a1a;}\n.aq-feature-card span{color:#555;}\n.aq-compare{overflow-x:auto;margin:1em 0 1.6em;}\n.aq-compare table{width:100%;border-collapse:collapse;font-family:Arial,sans-serif;font-size:0.88em;min-width:520px;}\n.aq-compare th{background:#c0392b;color:#fff;padding:9px 14px;text-align:center;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;}\n.aq-compare th:first-child{background:#1a1a1a;text-align:left;}\n.aq-compare td{padding:8px 14px;border-bottom:1px solid #ddd;text-align:center;}\n.aq-compare td:first-child{text-align:left;font-weight:600;color:#444;background:#fafafa;}\n.aq-compare tr:nth-child(even) td:not(:first-child){background:#fff8f8;}\n.aq-specs-table{width:100%;border-collapse:collapse;margin-top:1em;font-family:Arial,sans-serif;font-size:0.93em;}\n.aq-specs-table th{background:#1a1a1a;color:#fff;text-align:left;padding:9px 14px;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;font-size:0.82em;}\n.aq-specs-table td{padding:8px 14px;border-bottom:1px solid #e5e5e5;vertical-align:top;}\n.aq-specs-table tr:nth-child(even) td{background:#f9f9f9;}\n.aq-specs-table td:first-child{font-weight:600;width:45%;color:#444;}\n.aq-tab-radio{display:none;}\n.aq-tab-labels{display:flex;flex-wrap:wrap;gap:8px;margin:1.4em 0 0;}\n.aq-tab-label{display:inline-block;padding:10px 22px;border:2px solid #c0392b;background:#fff;color:#c0392b;font-weight:700;font-family:Arial,sans-serif;font-size:0.9em;cursor:pointer;border-radius:3px;letter-spacing:0.04em;user-select:none;}\n.aq-tab-label:hover{background:#e8c4c1;}\n.aq-tab-panel{display:none;}\n#aq-tab-300:checked ~ .aq-tab-labels label[for=\"aq-tab-300\"],#aq-tab-800:checked ~ .aq-tab-labels label[for=\"aq-tab-800\"],#aq-tab-1000:checked ~ .aq-tab-labels label[for=\"aq-tab-1000\"],#aq-tab-1200:checked ~ .aq-tab-labels label[for=\"aq-tab-1200\"]{background:#c0392b;color:#fff;}\n#aq-tab-300:checked ~ .aq-panels #aq-panel-300,#aq-tab-800:checked ~ .aq-panels #aq-panel-800,#aq-tab-1000:checked ~ .aq-panels #aq-panel-1000,#aq-tab-1200:checked ~ .aq-panels #aq-panel-1200{display:block;}\n.aq-note{font-family:Arial,sans-serif;font-size:0.82em;color:#777;margin-top:-0.5em;font-style:italic;}\n.aq-pd ul{margin:0.4em 0 1em 1.2em;}\n\u003c\/style\u003e\n\u003cdiv class=\"aq-pd\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eEshopps Power Flow\u003c\/strong\u003e is the classic way to run a sump on a tank that was never drilled. It hangs on the back rim, a U-tube siphon carries water over the glass into the external box, and gravity sends it down a 1 in bulkhead to the sump or refugium below. Four sizes cover everything from a 30 gallon reef to a 200 gallon display. Browse the rest of our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/skimmers-reactors-filtration\"\u003esumps, skimmers and filtration\u003c\/a\u003e, plus the \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/pumps-plumbing\"\u003ereturn pumps and plumbing\u003c\/a\u003e that complete the loop.\u003c\/p\u003e\n\u003cdiv class=\"aq-callout\"\u003e\n\u003cstrong\u003eNo drilling and no tank swap.\u003c\/strong\u003e Every Power Flow ships complete with the in-tank pre-filter box, the clear external box, U-tube siphon, foam cylinder, 1 in bulkhead and mounting hardware. Add a return pump and a sump and your heater, skimmer and media move out of the display.\u003c\/div\u003e\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe black pre-filter box sits inside the tank and skims water from the surface, where oils and film collect. A foam cylinder inside it keeps fish and debris out of the siphon. The smoke-tinted U-tube arches over the rim into the clear external box, which hangs on the outside of the glass and drains through the bulkhead. Once the U-tube is primed it stays full as long as the return pump runs. If the pump stops, the tank level only drops to the pre-filter box, the siphon holds, and flow resumes on its own when the pump comes back.\u003c\/p\u003e\n\u003ch2\u003eFeatures on Every Model\u003c\/h2\u003e\n\u003cdiv class=\"aq-features\"\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eOnly 3 in of clearance\u003c\/strong\u003e\u003cspan\u003eThe external box is 3 in deep on every model, so the tank can sit close to the wall.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eSlim pre-filter box\u003c\/strong\u003e\u003cspan\u003eThe in-tank box is noticeably slimmer than older overflow designs and takes little room from the display.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eSmoke-tinted U-tube\u003c\/strong\u003e\u003cspan\u003eTinted acrylic hides algae film and blends into the tank better than clear tube.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eRecessed cover\u003c\/strong\u003e\u003cspan\u003eThe external box lid sits flush to cut splash and keep the drain quiet.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eQuality acrylic\u003c\/strong\u003e\u003cspan\u003eClear external box and a black pre-filter box from a company that has built aquarium filtration for over two decades.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003e1 in bulkhead included\u003c\/strong\u003e\u003cspan\u003eStandard 1 in bulkhead fittings connect to 1 in PVC or flexible drain line.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eComplete kit\u003c\/strong\u003e\u003cspan\u003eFoam cylinder, nylon screws and wing nuts are in the box, ready to hang.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-feature-card\"\u003e\n\u003cstrong\u003eFresh or salt\u003c\/strong\u003e\u003cspan\u003eWorks on any sump-based system: reef, fish-only marine or a large freshwater setup.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eChoose Your Model\u003c\/h2\u003e\n\u003cp class=\"aq-note\"\u003eSelect a model in the tab section below for its full spec sheet.\u003c\/p\u003e\n\u003cdiv class=\"aq-compare\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003ePF-300\u003c\/th\u003e\n\u003cth\u003ePF-800\u003c\/th\u003e\n\u003cth\u003ePF-1000\u003c\/th\u003e\n\u003cth\u003ePF-1200\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank size\u003c\/td\u003e\n\u003ctd\u003e30 to 75 gal\u003c\/td\u003e\n\u003ctd\u003e75 to 125 gal\u003c\/td\u003e\n\u003ctd\u003e125 to 150 gal\u003c\/td\u003e\n\u003ctd\u003e150 to 200 gal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax flow\u003c\/td\u003e\n\u003ctd\u003e300 GPH\u003c\/td\u003e\n\u003ctd\u003e800 GPH\u003c\/td\u003e\n\u003ctd\u003e1,000 GPH\u003c\/td\u003e\n\u003ctd\u003e1,200 GPH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntake\u003c\/td\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003ctd\u003eDual\u003c\/td\u003e\n\u003ctd\u003eDual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eU-tubes\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1 in bulkheads\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal box (W x D x H)\u003c\/td\u003e\n\u003ctd\u003e6 x 3 x 10 in\u003c\/td\u003e\n\u003ctd\u003e8 x 3 x 10 in\u003c\/td\u003e\n\u003ctd\u003e9 x 3 x 10 in\u003c\/td\u003e\n\u003ctd\u003e10 x 3 x 10 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem number\u003c\/td\u003e\n\u003ctd\u003e89014\u003c\/td\u003e\n\u003ctd\u003e89024\u003c\/td\u003e\n\u003ctd\u003e89034\u003c\/td\u003e\n\u003ctd\u003e89044\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003ch2\u003eDetailed Model Specifications\u003c\/h2\u003e\n\u003cp\u003eClick a model below to view its full specification sheet.\u003c\/p\u003e\n\u003cinput type=\"radio\" class=\"aq-tab-radio\" id=\"aq-tab-300\" name=\"aq-spec-tab\" checked\u003e\n\u003cinput type=\"radio\" class=\"aq-tab-radio\" id=\"aq-tab-800\" name=\"aq-spec-tab\"\u003e\n\u003cinput type=\"radio\" class=\"aq-tab-radio\" id=\"aq-tab-1000\" name=\"aq-spec-tab\"\u003e\n\u003cinput type=\"radio\" class=\"aq-tab-radio\" id=\"aq-tab-1200\" name=\"aq-spec-tab\"\u003e\n\u003cdiv class=\"aq-tab-labels\"\u003e\n\u003clabel for=\"aq-tab-300\" class=\"aq-tab-label\"\u003ePF-300 · 30 to 75 gal\u003c\/label\u003e\n\u003clabel for=\"aq-tab-800\" class=\"aq-tab-label\"\u003ePF-800 · 75 to 125 gal\u003c\/label\u003e\n\u003clabel for=\"aq-tab-1000\" class=\"aq-tab-label\"\u003ePF-1000 · 125 to 150 gal\u003c\/label\u003e\n\u003clabel for=\"aq-tab-1200\" class=\"aq-tab-label\"\u003ePF-1200 · 150 to 200 gal\u003c\/label\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-panels\"\u003e\n\u003cdiv class=\"aq-tab-panel\" id=\"aq-panel-300\"\u003e\n\u003ch3\u003ePF-300 · Single intake · 300 GPH\u003c\/h3\u003e\n\u003cp\u003eThe compact choice for 30 to 75 gallon tanks running a modest return pump. One U-tube and one 1 in drain handle up to 300 GPH, which suits most nano and mid-size reefs and smaller planted sump builds.\u003c\/p\u003e\n\u003ctable class=\"aq-specs-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem number\u003c\/td\u003e\n\u003ctd\u003e89014\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank size\u003c\/td\u003e\n\u003ctd\u003e30 to 75 gal (up to 284 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax flow rate\u003c\/td\u003e\n\u003ctd\u003e300 GPH (1,135 LPH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntake\u003c\/td\u003e\n\u003ctd\u003eSingle, one U-tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrain\u003c\/td\u003e\n\u003ctd\u003eOne 1 in bulkhead\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal box\u003c\/td\u003e\n\u003ctd\u003e6 x 3 x 10 in (152 x 76 x 254 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance behind tank\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAcrylic, clear external box, black pre-filter box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIn the box\u003c\/td\u003e\n\u003ctd\u003ePre-filter box, external box, U-tube, foam cylinder, 1 in bulkhead, nylon screws and wing nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-tab-panel\" id=\"aq-panel-800\"\u003e\n\u003ch3\u003ePF-800 · Single intake · 800 GPH\u003c\/h3\u003e\n\u003cp\u003eThe step up for 75 to 125 gallon tanks. It keeps the single intake footprint but the wider box and drain path move up to 800 GPH, enough for a 4 foot reef with a mid-size return pump.\u003c\/p\u003e\n\u003ctable class=\"aq-specs-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem number\u003c\/td\u003e\n\u003ctd\u003e89024\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank size\u003c\/td\u003e\n\u003ctd\u003e75 to 125 gal (up to 378 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax flow rate\u003c\/td\u003e\n\u003ctd\u003e800 GPH (3,028 LPH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntake\u003c\/td\u003e\n\u003ctd\u003eSingle, one U-tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrain\u003c\/td\u003e\n\u003ctd\u003eOne 1 in bulkhead\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal box\u003c\/td\u003e\n\u003ctd\u003e8 x 3 x 10 in (203 x 76 x 254 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance behind tank\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAcrylic, clear external box, black pre-filter box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIn the box\u003c\/td\u003e\n\u003ctd\u003ePre-filter box, external box, U-tube, foam cylinder, 1 in bulkhead, nylon screws and wing nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-tab-panel\" id=\"aq-panel-1000\"\u003e\n\u003ch3\u003ePF-1000 · Dual intake · 1,000 GPH\u003c\/h3\u003e\n\u003cp\u003eBuilt for 125 to 150 gallon tanks. Two U-tubes feed the box and two 1 in drains carry up to 1,000 GPH, and the second siphon adds a margin of safety if one tube ever loses prime.\u003c\/p\u003e\n\u003ctable class=\"aq-specs-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem number\u003c\/td\u003e\n\u003ctd\u003e89034\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank size\u003c\/td\u003e\n\u003ctd\u003e125 to 150 gal (up to 567 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax flow rate\u003c\/td\u003e\n\u003ctd\u003e1,000 GPH (3,785 LPH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntake\u003c\/td\u003e\n\u003ctd\u003eDual, two U-tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrain\u003c\/td\u003e\n\u003ctd\u003eTwo 1 in bulkheads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal box\u003c\/td\u003e\n\u003ctd\u003e9 x 3 x 10 in (229 x 76 x 254 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance behind tank\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAcrylic, clear external box, black pre-filter box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIn the box\u003c\/td\u003e\n\u003ctd\u003ePre-filter box, external box, two U-tubes, two foam cylinders, two 1 in bulkheads, nylon screws and wing nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"aq-tab-panel\" id=\"aq-panel-1200\"\u003e\n\u003ch3\u003ePF-1200 · Dual intake · 1,200 GPH\u003c\/h3\u003e\n\u003cp\u003eThe largest Power Flow, sized for 150 to 200 gallon displays. Dual U-tubes and two 1 in drains move up to 1,200 GPH for high turnover on big reef and predator systems.\u003c\/p\u003e\n\u003ctable class=\"aq-specs-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem number\u003c\/td\u003e\n\u003ctd\u003e89044\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank size\u003c\/td\u003e\n\u003ctd\u003e150 to 200 gal (up to 757 L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax flow rate\u003c\/td\u003e\n\u003ctd\u003e1,200 GPH (4,542 LPH)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntake\u003c\/td\u003e\n\u003ctd\u003eDual, two U-tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrain\u003c\/td\u003e\n\u003ctd\u003eTwo 1 in bulkheads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal box\u003c\/td\u003e\n\u003ctd\u003e10 x 3 x 10 in (254 x 76 x 254 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClearance behind tank\u003c\/td\u003e\n\u003ctd\u003e3 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAcrylic, clear external box, black pre-filter box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIn the box\u003c\/td\u003e\n\u003ctd\u003ePre-filter box, external box, two U-tubes, two foam cylinders, two 1 in bulkheads, nylon screws and wing nuts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eWhich Model Is Right for You?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePF-300\u003c\/strong\u003e for 30 to 75 gallon tanks with a return pump moving up to 300 GPH at your sump-to-tank height.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePF-800\u003c\/strong\u003e for 75 to 125 gallon tanks. Same single intake, wider box, up to 800 GPH.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePF-1000\u003c\/strong\u003e for 125 to 150 gallon tanks. Dual U-tubes and two drains carry up to 1,000 GPH and give you a second siphon.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePF-1200\u003c\/strong\u003e for 150 to 200 gallon tanks. Dual intake with up to 1,200 GPH for big displays and high turnover.\u003c\/p\u003e\n\u003cp\u003eSize to the return pump, not just the tank. Look up the pump's flow at your actual head height, keep it under the overflow rating, and throttle the return with a valve if it runs close.\u003c\/p\u003e\n\u003ch2\u003eInstallation Tips\u003c\/h2\u003e\n\u003cp\u003eHang the external box on the back rim with the pre-filter box inside, then level it. Fill the U-tube completely with water, cover both ends and set it in place so no air is trapped at the top. Plumb the bulkhead to the sump with 1 in PVC or 1 in ID flexible tubing, start the return pump and watch the water line settle. Adjust the pre-filter box so the surface sits about halfway up its teeth. Check the U-tube for trapped air during routine maintenance and re-prime it if a bubble is growing.\u003c\/p\u003e\n\u003ch2\u003eRecommended Pairings\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/simplicity-dc-return-pump\"\u003eSimplicity DC Return Pump\u003c\/a\u003e, controllable flow you can dial in under the overflow rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/trigger-systems-titanium-34-sump\"\u003eTrigger Systems Titanium 34 Sump\u003c\/a\u003e or \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/icecap-15-reef-sump-v2\"\u003eIceCap 15 Reef Sump V2\u003c\/a\u003e for the cabinet below.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/eshopps-u-tube\"\u003eEshopps U-Tube\u003c\/a\u003e, a spare 1 in siphon tube for maintenance day.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/filter-sock\"\u003eAquarium Filter Sock\u003c\/a\u003e to catch debris where the drain enters the sump.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/loc-line-nozzles-3-4\"\u003eLoc-Line 3\/4 in Nozzles\u003c\/a\u003e to aim the return flow.\u003c\/li\u003e \u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/eshopps-eclipse-slim-drilled-overflow-box\"\u003eEshopps Eclipse\u003c\/a\u003e if you can drill the tank and want a slimmer, quieter drilled overflow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to drill my tank?\u003c\/strong\u003e\u003cbr\u003eNo. The Power Flow hangs on the back rim and uses a siphon, so it works on standard glass or acrylic tanks with no holes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens during a power outage?\u003c\/strong\u003e\u003cbr\u003eThe tank drains only down to the pre-filter box, then stops. The siphon stays primed and flow restarts when the return pump comes back. Leave room in the sump for that drain-down and for the water in the return line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size drain line do I need?\u003c\/strong\u003e\u003cbr\u003eEach bulkhead is 1 in. Use 1 in PVC or 1 in ID flexible tubing to the sump. The PF-1000 and PF-1200 have two drains.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it on a freshwater tank?\u003c\/strong\u003e\u003cbr\u003eYes. Any sump-based system works, fresh or salt.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the siphon break?\u003c\/strong\u003e\u003cbr\u003eOnly if air collects at the top of the U-tube. Check it during water changes and re-prime if needed, and keep the foam cylinder clean so flow through the pre-filter stays steady.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Eshopps","offers":[{"title":"PF-300 (30 to 75 gal)","offer_id":49330457182427,"sku":"89014","price":129.98,"currency_code":"USD","in_stock":false},{"title":"PF-800 (75 to 125 gal)","offer_id":49330457215195,"sku":"89024","price":139.98,"currency_code":"USD","in_stock":false},{"title":"PF-1000 (125 to 150 gal)","offer_id":49330457247963,"sku":"89034","price":159.98,"currency_code":"USD","in_stock":false},{"title":"PF-1200 (150 to 200 gal)","offer_id":49330457280731,"sku":"89044","price":169.98,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/89014.jpg?v=1789806274","url":"https:\/\/squeakysaquatics.com\/products\/eshopps-power-flow-hang-on-overflow-box","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}