--- product_id: 63239442 title: "Check valve 1/2\"inch-PEX Plastic Barb X Barb, \"PTFE\" Ball Stop with \"Viton O Ring\" for Positive Fluid Stop." brand: "i flow h2o" price: "Β£21.37" currency: GBP in_stock: true reviews_count: 8 category: "I Flow H2 O" url: https://www.desertcart.co.uk/products/63239442-check-valve-1-2inch-pex-plastic-barb-x-barb-ptfe store_origin: GB region: United Kingdom --- # Fluid Control Secure Seal Easy Install Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. **Brand:** i flow h2o **Price:** Β£21.37 **Availability:** βœ… In Stock ## Summary > πŸ’‘ Stop the Flow, Not Your Progress! ## Quick Answers - **What is this?** Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. by i flow h2o - **How much does it cost?** Β£21.37 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/63239442-check-valve-1-2inch-pex-plastic-barb-x-barb-ptfe) ## Best For - i flow h2o enthusiasts ## Why This Product - Trusted i flow h2o brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **πŸ”§ Hassle-Free Setup:** Quick connection for seamless installation. - β€’ **🚫 Prevents Backflow:** Say goodbye to unwanted fluid returns! - β€’ **βœ… Compliance Guaranteed:** NSF listed for your peace of mind. - β€’ **🌊 Versatile Applications:** Perfect for water, fuel, and more! - β€’ **πŸ”₯ High-Performance Rating:** Withstands up to 200Β°F and 200 PSI! ## Overview The i Flow H2O 1/2" PEX Check Valve is a robust, NSF-listed solution designed to prevent backflow in various applications, including potable water systems and fuel lines. With a durable plastic construction and a high-performance rating, it ensures reliable fluid control while being easy to install. ## Description Premium USA Quality Plastic 1/2”inch PEX Check Valve Posi-Seal Anti-Back Flow Its high strength super advanced β€œPTFE” solid ball and a β€œViton/FKM”-β€œO”- Ring encased by a poly-alloy durable Plastic that can withstand operating pressures of up to 80psi and high temperatures of up to 200F. Perfect solution for conditions in-line where Brass, Aluminum and copper create corrosion conditions that affects or compromises the quality of fluid flowing. Engineered Dynamic Design Called β€œMax-Flo-Chek” tm. This design allows for maximum flow in-line, when positive moving fluid flow occurs, the ball moves freely to a center cavity away from sealing β€œO” ring allowing for maximum flow all around the ball with zero fluid resistance. On an instant, negative or reverse fluid flow occurs, fluid pushes ball back into its posi-seal β€œO” ring for a solid stop. In this innovative dynamic design there are no hinged flaps, pins, screws, springs, diaphragms, rubber to restrict flow, malfunction, break or contaminate. To be used in vertical configuration. Review: Great quality. Did exactly what it needed to do. - Was looking for the best quality inline check valve for my fish tank. After searching through a bunch of check valves on desertcart I came across this one, the build look high quality so I decided to give it a chance. I am glad I did. Installation is very easy, pushed into the hose and I secured it with 2 clamps. Water flow runs great with no back pressure unlike a cheap spring valve I previously tried. Tested the product by unplugging my pump and it stopped the water from back flowing from my larger tank. Great product, highly recommend. Review: Description confusing yet good valve - I needed a check valve (CV) for a HVAC condensate pump that uses 3/8" ID vinyl drain hose. I use the SimpleAir Clean Flow Tabs for HVAC Drain Line Treatment. This CV uses a Teflon ball and Viton O-ring which will hold up to exposure to the Clean Flow Tabs. Other CV's I looked at used NBR and EPDM rubber which does not. This CV does not have a spring so cracking pressure is not an issue. The CV is mounted vertically and is working good since the 20th March 2021. The description for this CV is horrible. It begins with a 1/2" size which has nothing to do with this CV. Then it says, "Barbed Plastic,Size(OD)15/32"" which is mixed words that should be placed elsewhere and the size is incorrect. I measured the OD on each end: INLET: 0.437"; OUTLET: 0.431"; BARB: 0.471". 15/32" is 0.469". This fraction is close to the barb size yet not the diameter of each OD of the CV. Concerning photos: The best two photos are the 2nd showing the PTFE ball and Viton O-ring. The 5th photo has a scale indicating the length of the CV. The 7th photo of the orange plastic veneer caliper is silly because it shows nothing as it's not indicating a dimension on the CV. If a useful dimension needs to be shown then use a digital caliper measuring the barb. A photo labelling the CV with dimensions would be ideal. Then delete photos 5 and 7. The last of the description is about suggested applications. These suggestions should located in the bullet items to reduce clutter in the description. ## Features - βœ… PROBLEM IT SOLVES; Its an in-line one-way automatic valve stop, which prevents liquid-fluid from back-flowing, returning or loss of prime in a water, recirculating sys or fuel line. valvula de retencion agua plastico. - βœ… IN-LINE USES; Can safely be used in Potable water, Fish aquarium water filter pumps, Pex tubing, Boat marine, RV, Hydroponics grow, Hydronic heating, and /or harsh fluids like fuel, diesel, oils and mild chemicals. NOT 4 POND WATER USE. - βœ… COMPLIANT; NSF listed, meets UPC, IPC and cUPC standards, ASTMF-2159, PPSU, Lead free, non-corrosive, with a Dynamic "PTFE" solid ball stop and a "Viton/FKM-β€œO”- Ring inside for a "posi-seal-stop". Can withstand a high operating range of 200F and 200PSI, the "HIGHEST RATING IN IT'S CLASS". - βœ… EASY INSTALLATION; Arrows point liquid flow direction, ACTUAL SIZE 15/32"x 15/32” OD, Barb x Barb push-in quick connection for Hose, Pex, cpvc. Its durable alloy body allows for mechanical stainless steel clamps or crimping-rings brass/copper to secure a tight connection. - βœ… WARNING!!! "SIZE"- (OD)is smaller than 1/2"inch,look at "ACTUAL SIZE"!!..βœ… WARRANTY; If it fails! Within 3yrs of purchase, WE WILL BUY IT BACK! See wrnty. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07C16XM4R | | Best Sellers Rank | #84,790 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #188 in Check Valves | | Brand | i Flow H2O | | Brand Name | i Flow H2O | | Connector Type | Barb | | Customer Reviews | 4.1 out of 5 stars 148 Reviews | | Exterior Finish | Plastic | | Included Components | 1/2" PEX Check Valve | | Inlet Connection Size | 1/2"PEX Inches | | Inlet Connection Type | Barb | | Manufacturer | I Flow H2O | | Manufacturer Part Number | PCVB | | Material | Plastic | | Material Type | Plastic | | Maximum Pressure | 80 Pound per Square Inch | | Model Number | 12chkvlv | | Number of Pieces | 1 | | Number of Ports | 2 | | Outlet Connection Size | 1/2"PEX Inches | | Outlet Connection Type | Barb x Barb | | Set Name | 1/2 inch PEX | | Size | 1/2" inch PEX | | Smart Home Compatibility | Not Smart Home Compatible | | Specification Met | NSF, UPC, IPC, cUPC | | Thread Size | 1/2" | | UPC | 704907956889 | | Unit Count | 1 Count | | Valve Type | Check Valve | ## Images ![Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. - Image 1](https://m.media-amazon.com/images/I/51CE7UtoU9L.jpg) ![Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. - Image 2](https://m.media-amazon.com/images/I/51JRFG1jHxL.jpg) ![Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. - Image 3](https://m.media-amazon.com/images/I/61kbdi-MHsL.jpg) ![Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. - Image 4](https://m.media-amazon.com/images/I/71rW8N5y2CL.jpg) ![Check valve 1/2"inch-PEX Plastic Barb X Barb, "PTFE" Ball Stop with "Viton O Ring" for Positive Fluid Stop. - Image 5](https://m.media-amazon.com/images/I/61VDDYXZlwL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great quality. Did exactly what it needed to do. *by A***N on May 1, 2018* Was looking for the best quality inline check valve for my fish tank. After searching through a bunch of check valves on amazon I came across this one, the build look high quality so I decided to give it a chance. I am glad I did. Installation is very easy, pushed into the hose and I secured it with 2 clamps. Water flow runs great with no back pressure unlike a cheap spring valve I previously tried. Tested the product by unplugging my pump and it stopped the water from back flowing from my larger tank. Great product, highly recommend. ### ⭐⭐⭐⭐ Description confusing yet good valve *by W***N on April 4, 2021* I needed a check valve (CV) for a HVAC condensate pump that uses 3/8" ID vinyl drain hose. I use the SimpleAir Clean Flow Tabs for HVAC Drain Line Treatment. This CV uses a Teflon ball and Viton O-ring which will hold up to exposure to the Clean Flow Tabs. Other CV's I looked at used NBR and EPDM rubber which does not. This CV does not have a spring so cracking pressure is not an issue. The CV is mounted vertically and is working good since the 20th March 2021. The description for this CV is horrible. It begins with a 1/2" size which has nothing to do with this CV. Then it says, "Barbed Plastic,Size(OD)15/32"" which is mixed words that should be placed elsewhere and the size is incorrect. I measured the OD on each end: INLET: 0.437"; OUTLET: 0.431"; BARB: 0.471". 15/32" is 0.469". This fraction is close to the barb size yet not the diameter of each OD of the CV. Concerning photos: The best two photos are the 2nd showing the PTFE ball and Viton O-ring. The 5th photo has a scale indicating the length of the CV. The 7th photo of the orange plastic veneer caliper is silly because it shows nothing as it's not indicating a dimension on the CV. If a useful dimension needs to be shown then use a digital caliper measuring the barb. A photo labelling the CV with dimensions would be ideal. Then delete photos 5 and 7. The last of the description is about suggested applications. These suggestions should located in the bullet items to reduce clutter in the description. ### ⭐⭐⭐⭐⭐ Use this on the inlet to your leaking RV pump *by M***R on February 14, 2023* If your RV is overflowing your tank when hooked to city water, its internal check valve has gone bad. Instead of replacing the RV water pump buy this & put it in the water line going to the RV pump & save yourself the $50-120 cost of a new water pump. We did & it fixed the problem. The RV pump works if the city water isn’t connected & now it doesn’t overflow the tank when it is connected. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/63239442-check-valve-1-2inch-pex-plastic-barb-x-barb-ptfe](https://www.desertcart.co.uk/products/63239442-check-valve-1-2inch-pex-plastic-barb-x-barb-ptfe) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-24*