{"product_id":"yunziling-rv-vacuum-breaker-check-valve-571-vac-chk-a-brass-one-way-anti-siphon-for-freshwater-protection","title":"Yunziling RV Vacuum Breaker Check Valve 571-VAC-CHK-A — Brass, One-Way Anti-Siphon for Freshwater Protection","description":"\u003cp\u003e\u003cstrong\u003eThe Yunziling 571-VAC-CHK-A is a brass RV vacuum breaker check valve designed to stop black water backflow and protect your freshwater system during tank flushing.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for caravan, camper and travel-trailer waste systems, this vacuum breaker fits B\u0026amp;B 571-style check valve applications to prevent siphoning of black tank contents into the fresh water line. Built from brass for improved durability, it resists cracking and freezing better than plastic alternatives and withstands typical RV water pressures between 8 and 125 PSI. The model installs inline between the fresh water inlet and tank flusher to keep waste flows moving in the right direction and reduce the risk of leaks during flushing.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this valve prevent black water from contaminating my freshwater supply?\u003c\/h3\u003e\n\u003cp\u003eThe check valve opens when the flushing system pushes water toward the black tank and closes to block any reverse flow, eliminating siphoning when pressure drops. As a vacuum breaker, it also admits air to break suction and keep wastewater from being drawn back toward potable plumbing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne-way check mechanism prevents reverse flow of black tank contents\u003c\/li\u003e\n  \u003cli\u003eVacuum breaker function breaks suction to stop siphoning\u003c\/li\u003e\n  \u003cli\u003eInstalls between fresh water inlet and tank flusher for direct protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes the brass Yunziling 571-VAC-CHK-A better than plastic valves?\u003c\/h3\u003e\n\u003cp\u003eThis valve’s brass construction offers greater resistance to impact, freezing and long-term wear compared with plastic parts commonly used in RV plumbing. Brass maintains seal integrity across wider temperature ranges and reduces the chance of cracking under intermittent high pressure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass housing withstands 8–125 PSI, suitable for typical RV systems\u003c\/li\u003e\n  \u003cli\u003eLess prone to freeze damage or stress fractures than plastic valves\u003c\/li\u003e\n  \u003cli\u003eImproved longevity and consistent performance in mobile environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install the 571-VAC-CHK-A in my caravan or camper?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for someone familiar with RV plumbing: fit the valve inline with the black tank flushing line and position it at least 6 inches above the highest point of any connected waste line. If you’re uncertain about routing or connections, a professional plumber or RV technician can ensure correct placement and secure fittings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMount at least 6 inches above the highest point of connected waste lines\u003c\/li\u003e\n  \u003cli\u003eConnect between fresh water inlet and the tank flusher using compatible fittings\u003c\/li\u003e\n  \u003cli\u003eCheck seals and test by flushing to verify one-way operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan this valve be used across different RV and trailer models?\u003c\/h3\u003e\n\u003cp\u003eThe 571-VAC-CHK-A is built to work with a wide range of caravans, travel trailers, campers and even small motel-service systems that use similar check valve arrangements. Its standardized form factor and plumbing range make it a reliable replacement for worn or leaking check valves in many setups.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with B\u0026amp;B 571-style systems and most RV flushing lines\u003c\/li\u003e\n  \u003cli\u003eServes as a direct replacement for malfunctioning or leaking valves\u003c\/li\u003e\n  \u003cli\u003eUseful for campers, caravans, travel trailers and similar installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Yunziling 571-VAC-CHK-A is aimed at RV owners, caravan technicians and fleet maintenance teams who need a durable, easy-to-install check valve to protect freshwater systems during black tank flushing. It’s especially suited to users in colder climates or anyone replacing plastic valves that have failed; installers who prefer a brass component for longevity and reliability will find this model a practical upgrade.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What pressure range can the Yunziling 571-VAC-CHK-A handle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is rated for water pressures between 8 and 125 PSI, suitable for most RV systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Where should I mount this vacuum breaker in my RV?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Install it inline between the fresh water inlet and tank flusher at least 6 inches above the highest connected waste point.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Yunziling","offers":[{"title":"Default Title","offer_id":55166598021463,"sku":"B0DQ8279C4","price":36.21,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/yunziling-571-vac-chk-a-front-view.jpg?v=1790368887","url":"https:\/\/britishgarage.co.uk\/products\/yunziling-rv-vacuum-breaker-check-valve-571-vac-chk-a-brass-one-way-anti-siphon-for-freshwater-protection","provider":"British Garage","version":"1.0","type":"link"}