--- product_id: 10543007 title: "John Guest 3/8\" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified" brand: "john guest" price: "₨11911" currency: LKR in_stock: true category: "John Guest" url: https://www.desertcart.lk/products/10543007-john-guest-3-8-one-way-check-valve-ro-reverse store_origin: LK region: Sri Lanka --- # 3/8" barbed connector size spring-loaded low cracking pressure NSF & CUPC certified safety John Guest 3/8" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified **Brand:** john guest **Price:** ₨11911 **Availability:** βœ… In Stock ## Summary > 🚰 Elevate your water flow game with precision and peace of mind! ## Quick Answers - **What is this?** John Guest 3/8" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified by john guest - **How much does it cost?** ₨11911 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/10543007-john-guest-3-8-one-way-check-valve-ro-reverse) ## Best For - john guest enthusiasts ## Why This Product - Trusted john guest brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Flow Control Mastery:** Spring-loaded valve design minimizes backflow with ultra-low cracking pressure, protecting your system effortlessly. - β€’ **Certified Reliability:** NSF and CUPC certifications guarantee industry-leading safety and compliance you can trust in every installation. - β€’ **Universal Compatibility:** Works flawlessly with cast iron, plastic, copper, or steel pipes measuring 4 x 2 inchesβ€”versatility that fits your needs. - β€’ **Precision Fit, Zero Hassle:** 3/8" barbed connectors ensure seamless integration with plastic or soft metal tubing for a professional-grade setup. - β€’ **Tool-Friendly Installation:** Adjust clamps easily with common tools like screwdrivers or socket wrenches for a secure, leak-proof seal every time. ## Overview The John Guest 3/8" One Way Check Valve is a durable, NSF-certified plumbing fitting designed to prevent reverse flow in RO water filtration systems. Featuring a spring-loaded valve with low cracking pressure and universal compatibility with multiple pipe materials, it ensures reliable, leak-proof performance. Easy to install with standard tools, this valve is trusted by industry leaders for safe, efficient liquid flow control. ## Description Pipe connection has never been easier than with John Guest fittings. Produced at the request of leading companies in the Drinks Dispense industry, the Super Speedfit acetal Single Check Valve ensures protection against reversal of flow. The valves can be mounted in any position and an arrow molded into the body indicates direction of flow. They are designed for conenction to either plastic or soft metal tube and they are intended for liquids only. Note that they are not suitable for air and vacuum applications. The inner valve is spring loaded and the fitting produces low headloss. Valves with low fixed cracking pressure (i.e 10 cm water column), that have not been activated for some time may take several seconds to reseal It is the responsibility of the end user to verify that the product is suitable for his specific application. It is also recommended that the non-return valve is regularly checked and maintained. ## Features - Part #: 3/8SCV - DURABLE: No hub pipe fitting is constructed with corrugated stainless steel for long-lasting reliability - EASY TO USE: The stainless steel clamps of the no hub pipe coupling can be easily adjusted with a screwdriver, nut driver, or socket wrench for a secure and tight seal - MEASUREMENT: The stainless steel coupler can be used on cast iron, plastic, copper, or steel pipe measuring 4 x 2 inches - CERTIFIED: No hub couplings are certified by the Canadian Uniform Plumbing Code (CUPC) and ASTM C-1277 for product safety ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00BK7HHMQ | | Best Sellers Rank | #183,914 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #408 in Check Valves | | Brand | John Guest | | Brand Name | John Guest | | Customer Reviews | 4.3 out of 5 stars 127 Reviews | | Exterior Finish | Plastic,Metal | | Inlet Connection Size | 0.38 inches | | Inlet Connection Type | Barbed Connector | | Manufacturer | John Guest | | Manufacturer Part Number | FBA_3/8SCV | | Material | Metal, Plastic | | Material Type | Metal, Plastic | | Model Number | COMINHKR046077 | | Number of Items | 1 | | Number of Packs | 1 | | Number of Pieces | 1 | | Number of Ports | 1 | | Outlet Connection Size | 0.38 inches | | Outlet Connection Type | Barbed Connector | | Size | 3/8" QC | | Specification Met | NSF | | Thread Size | 3/8" | | UPC | 665626002571 | | Unit Count | 1 Count | | Valve Type | Check Valve | ## Images ![John Guest 3/8" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified - Image 1](https://m.media-amazon.com/images/I/71AjXs1nycL.jpg) ![John Guest 3/8" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified - Image 2](https://m.media-amazon.com/images/I/71Gwp81dEoL.jpg) ![John Guest 3/8" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified - Image 3](https://m.media-amazon.com/images/I/71tphFw3nvL.jpg) ## Frequently Bought Together - John Guest 3/8SCV 3/8" Push Fit Single Check Valve, Non Return Valve (Speedfit) - John Guest PPSV041212WP Plastic Push Shut Off Valve, White, 3/8 in. Tube OD - John Guest 15mm x 3/8" Straight Connector --- ## 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.lk/products/10543007-john-guest-3-8-one-way-check-valve-ro-reverse](https://www.desertcart.lk/products/10543007-john-guest-3-8-one-way-check-valve-ro-reverse) --- *Product available on Desertcart Sri Lanka* *Store origin: LK* *Last updated: 2026-09-16*