Aimery RV Vacuum Breaker Check Valve — 1/2" NPT Brass Replacement for B&B 571, Metal Core & Corrosion-Resistant

The Aimery 571-VAC-CHK-A is an upgraded brass RV vacuum breaker check valve designed to stop backflow and replace leaking B&B 571 units in camper black tank flush systems.

When a black tank flush check valve fails it can allow sewage or wastewater to flow back into the flush line or drip onto your camper floor. The Aimery replacement uses corrosion-resistant brass and a metal valve core to improve longevity and resist wear in marine and RV environments. It fits 1/2" NPT male connections and is specified for typical RV flush system pressures and temperatures.

How does this valve prevent backflow in my RV black tank flush?

The Aimery check valve is a one-way vacuum breaker built to stop reverse flow during and after tank flushing. Its metal core and precisely machined seat create a tight seal that blocks wastewater from returning into the flush line. The valve operates automatically—no tools or manual intervention needed—once installed in the flush plumbing.

• One-way check design prevents reverse sewage flow.
• Metal valve core for reliable sealing and longer life.
• 1/2" NPT male threads for common RV plumbing fittings.
• Automatic operation—engages when fluid pressure drops or reverses.

Will this unit handle typical RV water pressure and temperature?

Yes. The 571-VAC-CHK-A is rated to tolerate intermittent pressures up to 125 PSI and working temperatures up to 110°F, which covers normal RV black tank flush cycles and outdoor conditions. The brass body resists corrosion better than many plastic alternatives, reducing risk of stress cracking in fluctuating temperatures.

• Intermittent pressure rating: up to 125 PSI.
• Temperature rating: safe to 110°F operating temperature.
• Lead-free brass construction for corrosion resistance.
• Durable under repeated flush cycles and seasonal storage.

Is the Aimery valve a direct replacement for B&B 571 models and easy to install?

The Aimery 571-VAC-CHK-A is engineered to be a direct swap for many B&B 571-style vacuum breaker check valves used in camper flush systems. It features 1/2" NPT male threads on both ends, allowing straightforward removal of the old valve and threading in the replacement without modifying the plumbing. Basic hand tools and plumber's tape are all that’s typically required for a secure install.

• Direct fit for many B&B 571 check valve applications.
• 1/2" NPT male threads on inlet and outlet for easy swap.
• Install with common hand tools and plumber’s tape—no special adapter usually needed.
• Metal core resists damage during handling and installation.

What maintenance and reliability can I expect from this replacement valve?

Because it’s made from upgraded brass with a metal valve core, the Aimery unit minimizes common failure modes such as brittle plastic cracking or deteriorating seals. Routine checks when winterizing or performing tank maintenance are advised, but under normal use the valve should offer years of reliable service. Aimery also provides responsive customer support for troubleshooting or replacement needs.

• Brass body and metal core reduce corrosion and breakage risk.
• Recommended periodic inspection during seasonal service.
• Designed for long-term use in RV and travel trailer environments.
• Manufacturer support available for product issues.

Who is this for: RV owners, camper and motorhome DIYers, and service technicians who need a durable, straightforward replacement for leaking or cracked black-tank flush check valves. If you want a long-lasting, corrosion-resistant one-way valve that threads into standard 1/2" NPT RV plumbing and reduces the chance of backflow or messy leaks, the Aimery 571-VAC-CHK-A is built for that purpose.