{"product_id":"mtsooning-rv-brass-vacuum-breaker-check-valve-571-vac-chk-a-inline-backflow-preventer-8-125-psi","title":"Mtsooning RV Brass Vacuum Breaker Check Valve 571-VAC-CHK-A — Inline Backflow Preventer, 8–125 PSI","description":"\u003cp\u003e\u003cstrong\u003eThe Mtsooning 571-VAC-CHK-A is a brass RV vacuum breaker check valve designed to stop backflow into your freshwater line and protect black-tank flushing systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen flushing an RV black tank or connecting a freshwater inlet to a tank flusher, unwanted backflow or siphoning can contaminate potable water and damage plumbing. The Mtsooning 571-VAC-CHK-A provides a simple, durable barrier: it permits flow in the intended direction while preventing waste or wastewater from reversing into the freshwater feed. Built from brass and rated for typical RV water pressures, this check valve is a direct, compact solution for camper, travel trailer, and motorhome plumbing reliability.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this valve prevent backflow during black tank flushing?\u003c\/h3\u003e\n\u003cp\u003eThe check valve opens when freshwater is pushed toward the tank flusher and closes automatically if pressure drops or suction tries to pull liquid back. That one-way action blocks any waste or contaminated fluid from traveling upstream into your freshwater plumbing. It acts as a passive safeguard without moving parts that need power.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne-way check design prevents reverse flow into freshwater inlet\u003c\/li\u003e\n  \u003cli\u003eAutomatically seals when pressure drops or siphoning occurs\u003c\/li\u003e\n  \u003cli\u003eInstalls inline between the freshwater inlet and tank flusher\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs the Mtsooning 571-VAC-CHK-A durable enough for RV water systems?\u003c\/h3\u003e\n\u003cp\u003eYes — the valve is machined from brass to resist corrosion and handle the pressures common in RV systems. Its construction tolerates typical freshwater pressures from 8 to 125 PSI, which covers city hookups, onboard pumps, and most service conditions. That material choice reduces the risk of leaks and extends service life compared with plastic alternatives.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass body for corrosion resistance and long-term durability\u003c\/li\u003e\n  \u003cli\u003eRated to withstand 8–125 PSI operating pressures\u003c\/li\u003e\n  \u003cli\u003eSuitable for intermittent outdoor exposure in RV plumbing bays\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhere and how should I install the vacuum breaker check valve?\u003c\/h3\u003e\n\u003cp\u003eMount the valve inline at the freshwater inlet, positioned at least six inches above the highest connected point to the waste tank to maintain proper vacuum-breaking action. Orient the valve so its flow direction arrow points toward the tank flusher. Use compatible fittings and thread sealant appropriate for potable water plumbing to ensure a leak-free connection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstall at least 6 inches above the highest point connected to the waste tank\u003c\/li\u003e\n  \u003cli\u003eAlign flow arrow toward the tank flusher; use proper potable-water fittings\u003c\/li\u003e\n  \u003cli\u003eReplace a leaking or old breaker check valve to restore backflow protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich RVs and situations is this valve compatible with?\u003c\/h3\u003e\n\u003cp\u003eThe 571-VAC-CHK-A is intended as a replacement or upgrade for many RV models, campers, travel trailers, and motorhomes that use a black tank flushing arrangement or freshwater inlet. It’s a compact retrofit part that fits where inline backflow prevention is required. Check thread sizes and connection types to confirm fitment before purchase or bring the old valve to match exact fittings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for RVs, campers, travel trailers, and motorhomes\u003c\/li\u003e\n  \u003cli\u003eWorks as a replacement for existing black tank flush breaker valves\u003c\/li\u003e\n  \u003cli\u003eConfirm thread size and fitting compatibility during installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Mtsooning 571-VAC-CHK-A is aimed at RV owners, DIY plumbers, and service technicians who want a dependable, low-maintenance way to protect freshwater lines during black-tank flushing. If you need an inline, brass backflow preventer that tolerates typical RV water pressures and installs quickly where freshwater meets tank-flush assemblies, this valve offers a compact, long-lasting option. It’s especially useful when an existing vacuum breaker leaks or when you’re upgrading to more durable materials for seasonal RV maintenance.\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: Will this valve fit my RV freshwater inlet?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Check your inlet thread size and fitting type; the 571-VAC-CHK-A fits many RV setups but confirm compatibility before buying.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this valve handle city water pressure?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it's rated for 8–125 PSI, covering typical city hookups and RV pump pressures.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Mtsooning","offers":[{"title":"Default Title","offer_id":48086033760414,"sku":"B0DP49KRLN","price":45.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mtsooning-571-vac-chk-a-front-view.jpg?v=1785882434","url":"https:\/\/northtrailauto.ca\/products\/mtsooning-rv-brass-vacuum-breaker-check-valve-571-vac-chk-a-inline-backflow-preventer-8-125-psi","provider":"North Trail Auto","version":"1.0","type":"link"}