{"product_id":"bioscape-bioscape-airline-check-valves-2-pack","title":"Bioscape Airline Check Valves 2 Pack","description":"\u003cp\u003e\u003cstrong\u003eStops tank water siphoning back into an air pump.\u003c\/strong\u003e This two-pack of Bioscape airline check valves fits standard aquarium airline and lets air flow one way only — toward the tank. When the pump switches off, the valve closes and stops water running back down the line into the pump body.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-way valve action\u003c\/strong\u003e — blocks backflow the moment the pump stops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits standard airline\u003c\/strong\u003e — drops inline with the tubing you already run.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-pack\u003c\/strong\u003e — enough for a pump with two outlets, or a spare for later.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEssential wherever a pump sits at or below the waterline\u003c\/strong\u003e — the more common the setup, the more it matters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePack size\u003c\/th\u003e\n\u003ctd\u003e2 valves\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eOne-way airline check valve (non-return valve)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFitting\u003c\/th\u003e\n\u003ctd\u003eStandard aquarium airline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003eBioscape does not publish valve dimensions or the exact plastic used for this part — if you need to confirm fit against a specific fitting, check the valve against a sample of your existing airline before ordering in bulk.\u003c\/p\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuitable for:\u003c\/strong\u003e any air pump run where the pump sits at or below the tank's waterline — the majority of sump and cabinet installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e use as a flow control valve — these only stop backflow, they don't regulate airflow. For that, use an airline control valve instead.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCheck the valve moves freely every few months — mineral build-up can stick a valve closed or open.\u003c\/li\u003e\n\u003cli\u003eReplace the valve if it no longer seats cleanly; a stuck-open valve gives no protection at all.\u003c\/li\u003e\n\u003cli\u003eFit with the arrow (where marked) pointing toward the tank, in the direction of airflow.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eGoes well with\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/bioscape-air-pump-1000\"\u003eBioscape Air Pump 1000\u003c\/a\u003e — already includes one bonus valve; this pack covers a second outlet or a replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/bioscape-bioscape-airline-roll-100-metres\"\u003eBioscape Airline Tubing 100 m Roll\u003c\/a\u003e — bulk airline to run alongside the valve.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/bioscape-airline-control-valve-set-2-pack-extendable\"\u003eBioscape Airline Control Valve Set\u003c\/a\u003e — for adjusting airflow, not just protecting against backflow.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by the standard Bioscape supplier warranty against manufacturing defects, in addition to the consumer guarantees you're entitled to under Australian Consumer Law. Ships as a small, light parcel with standard delivery.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eDo I need one of these, or is my pump fine without it?\u003c\/h4\u003e\u003cp\u003eIf the pump sits above the aquarium's waterline, water can't siphon back and a check valve is optional insurance. If the pump is level with or below the waterline — common with cabinet-mounted or sump setups — a check valve is essential.\u003c\/p\u003e\u003ch4\u003eCan I use one valve for two outlets?\u003c\/h4\u003e\u003cp\u003eNo — each outlet needs its own valve. This two-pack suits a twin-outlet pump or one pump plus a spare.\u003c\/p\u003e\u003ch4\u003eDoes this control how much air comes through?\u003c\/h4\u003e\u003cp\u003eNo, it only blocks backflow. Use a Bioscape airline control valve if you want to reduce airflow to a stone or ornament.\u003c\/p\u003e\u003ch4\u003eWill it fit airline from other brands?\u003c\/h4\u003e\u003cp\u003eIt's sized for standard aquarium airline, which is the same bore used across most Australian retail brands, but check against your existing tubing if you're unsure.\u003c\/p\u003e","brand":"Bioscape","offers":[{"title":"Default Title","offer_id":54774337765667,"sku":"BIS122","price":7.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/BIS122_4.jpg?v=1782868933","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/bioscape-bioscape-airline-check-valves-2-pack","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}