{"product_id":"camco-23303-fresh-water-backflow-preventer-1-2-brass","title":"Camco 23303 Fresh Water Backflow Preventer, 1\/2\" Brass","description":"\u003cp class=\"nvn-hero\"\u003eThe Camco 23303 is a 1\/2 inch brass backflow preventer that protects your fresh water system. It lets water flow one way, toward the water heater, and stops it from pushing back into your potable lines. Heavy-duty brass, a stainless spring, and low-lead compliance make it an easy, honest upgrade for any RV or boat freshwater setup.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eA backflow preventer is one of those small brass fittings that does a big job quietly. The Camco 23303 sits on your fresh water line and makes sure water only moves in one direction, toward your water heater, and never gets pushed back into your potable supply. It's a check valve at heart. Water flows through in the right direction, and a stainless spring keeps it from coming back the other way. That's the whole trick, and it's exactly what you want protecting the clean side of your system.\u003c\/p\u003e\n\u003cp\u003eWhy does that matter? On an RV or a boat, your water heater and your fresh water tank share the same plumbing. Without a one-way valve in the right spot, heated or treated water can migrate back toward your freshwater lines, especially when pressures shift as the heater cycles or when you're running a bypass for winterizing. This little fitting stops that cold. It keeps the hot side and the fresh side honest with each other, which is exactly what you want when you're drinking from that tank.\u003c\/p\u003e\n\u003cp\u003eCamco built the 23303 out of heavy-duty brass with a stainless steel spring inside. Brass is the right call here. It handles hot water, resists corrosion on a potable line, and threads cleanly without galling. The stainless spring is what keeps the check valve working season after season, since it's the one moving part and it lives in constant contact with water. Cheaper valves use materials that fatigue or corrode over time. This one is built to sit in the line and be forgotten, which is about the best thing you can say about a plumbing part you'll never think about again once it's installed.\u003c\/p\u003e\n\u003cp\u003eIt also complies with California and Vermont regulations for brass content, which is the low-lead standard for anything that touches drinking water. If you've ever tried to source plumbing parts and run into the lead-free requirement, you know it isn't optional in a lot of places anymore. The 23303 meets it, so you can put it on a potable water line without a second thought. The packaging is printed in English, French, and Spanish, which tells you it's the same part sold right across North America.\u003c\/p\u003e\n\u003cp\u003eInstallation is straightforward if you've done any threaded plumbing. One end is 1\/2 inch male NPT, the other is 1\/2 inch female NPT, so it threads inline on a standard half-inch fresh water connection. Wrap the male threads with a few turns of PTFE tape or a dab of potable-safe thread sealant, thread it in hand-tight, then snug it with a wrench. The one thing you can't skip is flow direction. A backflow preventer only works one way, so make sure the fitting points the direction water is meant to travel, toward the heater. Get it backwards and you'll block flow instead of protecting it.\u003c\/p\u003e\n\u003cp\u003eMost folks install this right at the water heater inlet, which is where backflow does the most damage. It's also a smart addition when you set up a winterizing bypass, since you don't want antifreeze or drained water sneaking back into lines you've already cleared. And while Camco markets this one for RV water heaters, the same half-inch NPT freshwater plumbing shows up on plenty of boats with pressurized water systems and onboard heaters. If your fittings match, it works the same way out on the water.\u003c\/p\u003e\n\u003cp\u003eIt's an inexpensive part that prevents an expensive headache. One backflow preventer per box, brass and stainless, ready to thread into your system. If you're not sure whether your setup already has one, it's cheap insurance to add before your next trip. And if it's an older valve that's starting to weep or stick, swapping in a fresh one takes a few minutes. We're an authorized Camco dealer, so you're getting the genuine 23303 with the full manufacturer warranty behind it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e1\/2 inch male NPT x 1\/2 inch female NPT threads for inline install on a standard half-inch fresh water connection\u003c\/li\u003e\n  \u003cli\u003eHeavy-duty brass body resists corrosion and handles hot water on the potable side\u003c\/li\u003e\n  \u003cli\u003eStainless steel internal spring keeps the one-way check working season after season\u003c\/li\u003e\n  \u003cli\u003eOne-way flow design blocks backflow from the water heater into your fresh water supply\u003c\/li\u003e\n  \u003cli\u003eComplies with California and Vermont low-lead brass regulations, safe for drinking water lines\u003c\/li\u003e\n  \u003cli\u003eSold as a single unit, ready to thread in with PTFE tape or potable-safe thread sealant\u003c\/li\u003e\n  \u003cli\u003eWorks on RV water heaters and boat freshwater systems that use 1\/2 inch NPT fittings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Camco reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the Camco 23303 backflow preventer do?\u003c\/summary\u003e\n    \u003cp\u003eIt's a one-way check valve. It lets fresh water flow toward your water heater and stops it from pushing back into your potable supply lines. That protects the clean side of your system from backflow.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere does it install?\u003c\/summary\u003e\n    \u003cp\u003eMost people put it inline at the water heater inlet, which is where backflow does the most damage. It's also a smart add when you set up a winterizing bypass.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the thread sizes?\u003c\/summary\u003e\n    \u003cp\u003eOne end is 1\/2 inch male NPT and the other is 1\/2 inch female NPT, so it threads inline on a standard half-inch fresh water connection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it safe for drinking water?\u003c\/summary\u003e\n    \u003cp\u003eYes. It complies with California and Vermont regulations for brass content, which is the low-lead standard for parts that touch potable water.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is it made of?\u003c\/summary\u003e\n    \u003cp\u003eA heavy-duty brass body with a stainless steel spring inside. Brass handles hot water and resists corrosion, and the stainless spring keeps the check valve working over the long haul.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes flow direction matter when I install it?\u003c\/summary\u003e\n    \u003cp\u003eIt does. A backflow preventer only works one way, so orient the fitting so water flows the direction it's meant to travel, toward the heater. Installed backwards it will block flow instead of protecting it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need thread sealant or tape?\u003c\/summary\u003e\n    \u003cp\u003eYes. Wrap the male NPT threads with a few turns of PTFE tape or use a potable-safe thread sealant, then thread it in hand-tight and snug it with a wrench.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it on a boat freshwater system?\u003c\/summary\u003e\n    \u003cp\u003eCamco markets it for RV water heaters, but the same 1\/2 inch NPT freshwater plumbing shows up on many boats with pressurized water systems and onboard heaters. If your fittings match, it works the same way.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow many come in the box?\u003c\/summary\u003e\n    \u003cp\u003eOne backflow preventer per package. It's sold as a single unit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it help when winterizing?\u003c\/summary\u003e\n    \u003cp\u003eYes. On a winterizing bypass it helps keep antifreeze or drained water from sneaking back into lines you've already cleared.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eCamco 23303 Fresh Water Backflow Preventer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eCamco\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e23303\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e014717233033\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eInlet Connection\u003c\/th\u003e\n\u003ctd\u003e1\/2 Inch Male NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutlet Connection\u003c\/th\u003e\n\u003ctd\u003e1\/2 Inch Female NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpring Material\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFlow Direction\u003c\/th\u003e\n\u003ctd\u003eOne-way (backflow prevention)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLead Compliance\u003c\/th\u003e\n\u003ctd\u003eComplies with CA and VT regulations for brass content\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003eSingle (1)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackaging Language\u003c\/th\u003e\n\u003ctd\u003eEnglish \/ French \/ Spanish\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eFresh water \/ water heater line\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the Camco 23303 backflow preventer do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a one-way check valve. It lets fresh water flow toward your water heater and stops it from pushing back into your potable supply lines. That protects the clean side of your system from backflow.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where does it install?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Most people put it inline at the water heater inlet, which is where backflow does the most damage. It's also a smart add when you set up a winterizing bypass.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the thread sizes?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"One end is 1\/2 inch male NPT and the other is 1\/2 inch female NPT, so it threads inline on a standard half-inch fresh water connection.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it safe for drinking water?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It complies with California and Vermont regulations for brass content, which is the low-lead standard for parts that touch potable water.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is it made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A heavy-duty brass body with a stainless steel spring inside. Brass handles hot water and resists corrosion, and the stainless spring keeps the check valve working over the long haul.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does flow direction matter when I install it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It does. A backflow preventer only works one way, so orient the fitting so water flows the direction it's meant to travel, toward the heater. 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