{"product_id":"loc-line-check-valve","title":"Loc-Line Check Valve","description":"\u003cp\u003e\u003cstrong\u003eThe Loc-Line Check Valve\u003c\/strong\u003e snaps into a 1\/2\" Loc-Line run and lets water flow one way only. On an aquarium return line it helps stop back-siphon, so when the pump shuts off for feeding or a power outage, your display is not quietly draining into the sump. Genuine Loc-Line, built from the same saltwater resistant acetal as the rest of the system, with a nitrile seal.\u003c\/p\u003e\n\u003ch3 style=\"margin: 14px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eWhy a Check Valve\u003c\/h3\u003e\n\u003cp\u003eAny return nozzle that sits below the waterline becomes a siphon the moment the pump stops. A sump sized for normal operation can overflow fast when the display starts draining backwards. A check valve in the return line blocks that reverse flow automatically, no float switches or drilled siphon breaks required. It is cheap insurance for AIO conversions, nano reefs, and any sump where headroom is tight.\u003c\/p\u003e\n\u003ch3 style=\"margin: 14px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eHow to Install\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSnap the valve into the 1\/2\" run between the pump side and the nozzle side. The flow arrow points toward the tank.\u003c\/li\u003e\n\u003cli\u003ePlace it somewhere easy to reach: like every check valve, it should be inspected and cleaned periodically so the seal stays free of algae and detritus.\u003c\/li\u003e\n\u003cli\u003eOur \u003ca href=\"https:\/\/squeakysaquatics.com\/products\/loc-line-assembly-pliers\"\u003eLoc-Line Assembly Pliers\u003c\/a\u003e make seating and separating the ball joints painless.\u003c\/li\u003e\n\u003cli\u003eTreat it as a backup, not a guarantee. Keep enough empty sump volume to absorb some backflow, because a fouled check valve can leak.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 14px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; font-size: 0.95em;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600; width: 38%;\"\u003eSystem Size\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003e1\/2\" hose ID Loc-Line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600;\"\u003eSKU\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003eLOC39851\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600;\"\u003eFunction\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003eOne-way flow, helps prevent back-siphon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003eAcetal copolymer body, nitrile (Buna-N) seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600;\"\u003eConnection\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003eBall and socket on both ends, snaps into any 1\/2\" Loc-Line run\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600;\"\u003eUse\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003eFreshwater and saltwater aquariums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px; background: #E0F7FA; font-weight: 600;\"\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #B2EBF2; padding: 6px 8px;\"\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"margin: 14px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/loc-line-6-segment-sections\"\u003eLoc-Line 6-Segment Sections\u003c\/a\u003e: build or extend the run\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/loc-line-nozzles-1-2\"\u003eLoc-Line 1\/2\" Nozzles\u003c\/a\u003e: round, flare, spray bar, and 7 hole tips\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/loc-line-in-line-valves\"\u003eLoc-Line In-Line Valves\u003c\/a\u003e: quarter turn manual flow control\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/loc-line-assembly-pliers\"\u003eLoc-Line Assembly Pliers\u003c\/a\u003e: the joint tool worth owning\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/salt-water\"\u003eShop all saltwater supplies\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin: 14px 0 4px; font-size: 1.05em; font-weight: 600; line-height: 1.25; border-left: 4px solid #006064; padding-left: 8px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWill this stop my sump from overflowing in a power outage?\u003c\/strong\u003e It blocks reverse flow through the return line, which is the main back-siphon path. Pair it with sensible sump headroom, since any check valve can weep if debris holds the seal open.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it restrict flow?\u003c\/strong\u003e A small amount, like any check valve. Most return pumps will not show a noticeable drop on a 1\/2\" line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should I clean it?\u003c\/strong\u003e Pop it out and rinse during regular maintenance, every month or two on most systems. A clean seal is what keeps it trustworthy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it fit the 3\/4\" system?\u003c\/strong\u003e This valve is for the 1\/2\" Loc-Line system only. For 3\/4\" runs, use a barbed or union-style check valve in the hard plumbing before the Loc-Line section.\u003c\/p\u003e","brand":"Loc-Line","offers":[{"title":"1\/2\"","offer_id":48868800233691,"sku":"LOC39851","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_e9f09667-8e64-429a-8628-299b626f165c.png?v=1781269957","url":"https:\/\/squeakysaquatics.com\/products\/loc-line-check-valve","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}