Choosing the right water tank check valve helps protect your plumbing from backflow, maintain consistent water flow, and prevent contamination. This guide reviews five well-regarded options, including brass, vacuum breaker, and RV-specific valves, to help homeowners and RV enthusiasts compare materials, compatibility, and installation considerations.
Overview of selected products:
- Merrill MFG CVNL100 1″ No-Lead Brass Check Valve (1″ NPT, IAPMO certified)
- American Granby 1″ No Lead Check Valve CVNL100BS Brass
- RecPro RV Vacuum Breaker Check Valve 571-VAC-CHK-A
- Yunziling RV Vacuum Breaker Check Valve 571-VAC-CHK-A Brass
- AquaNPT RV Water Heater Check Valve 1/2″ NPT Brass
| Product | Brand | Key Point |
|---|---|---|
| Merrill MFG CVNL100 | Merrill | No-Lead Brass, 1″ NPT, IAPMO certified |
| American Granby CVNL100BS | American Granby | 1″ brass no-lead, pressure-tank use |
| RecPro 571-VAC-CHK-A | RecPro | RV vacuum breaker for potable systems |
| Yunziling 571-VAC-CHK-A | Yunziling | Brass vacuum breaker, 6″ install spec |
| AquaNPT 1/2″ RV Check Valve | AquaNPT | Lead-free brass, built-in check valve |
Merrill MFG CVNL100 1″ No-Lead Brass Check Valve
The Merrill CVNL100 is a 1″ female NPT brass check valve designed for backflow prevention in potable water lines. It uses No Lead brass construction for long-term reliability and is IAPMO certified for compliance. Its robust brass body supports steady flow while resisting reverse flow, helping to protect downstream fixtures.
American Granby 1″ No Lead Brass Check Valve CVNL100BS
This 1″ CVNL100BS valve from American Granby provides a lead-free brass solution for water wells, pressure tanks, or jet pumps. It’s built to withstand regular pressure cycling and offers reliable backflow prevention in residential water systems. The brass construction ensures durability in varying temperatures and pressures.
RecPro RV Vacuum Breaker Check Valve 571-VAC-CHK-A
RecPro’s RV vacuum breaker is designed to protect freshwater systems in RV applications. It’s a high-hazard protectant installed between the inlet and tank flusher, ensuring that flushing water does not backflow into the potable supply. Proper installation is essential to maintain pressure balance and prevent backflow-related issues.
Yunziling RV Vacuum Breaker Check Valve 571-VAC-CHK-A
This brass vacuum breaker check valve from Yunziling is designed for use with B&B 571 valves in RV black water flushing systems. It withstands typical water pressure ranges (8-125 PSI) and is mounted at least 6 inches above the highest connected point. Brass construction offers improved durability in cold climates compared with plastics.
AquaNPT RV Water Heater Check Valve 1/2″ NPT
The AquaNPT 1/2″ RV water heater check valve is a brass, lead-free backflow preventer with a built-in stainless steel spring. It secures connections and stops backflow from the water heater into the freshwater system, aligning with NSF potable water requirements for safe use in RV and similar setups.
Buying Guide: Key Purchase Considerations
- Material and safety: Lead-free brass is common for potable water systems, offering durability and compliance with safety standards. Vacuum breakers add additional protection for RV black tank flush lines.
- Pressure and installation: Check valve compatibility with your system’s pressure range and NPT thread size. Some units are designed for 1″ lines, others for smaller or larger fittings.
- Intended use: For RVs, vacuum breakers are often installed between the freshwater inlet and flusher. For wells and pressure tanks, standard inline check valves provide backflow prevention and flow control.
- Height and placement: Vacuum breakers typically require installation above the highest point in the line to prevent backflow correctly. Follow manufacturer spacing guidelines.
- Maintenance: Brass valves resist corrosion well; however, periodic inspection for leaks or sticking valves is advisable to maintain optimal performance.
- Certification: Look for IAPMO or NSF certifications when selecting valves for potable water to ensure compliance and safety.
Choosing the right valve depends on your system type—residential water lines, well pumps, or RV black tank flush setups. Evaluate the material, connection size, and whether you need a simple inline check valve or a vacuum breaker with added backflow protection.