Check Valve Kit (W/ O-Ring)

Rheem RTG20319AS Check Valve Kit with O-Ring – OEM Replacement for Tankless Gas Units

The Rheem RTG20319AS Check Valve Kit is a factory-authorized component engineered for use with specific Rheem tankless gas water heaters. This kit is designed to prevent unwanted backflow within the recirculation system, helping maintain consistent water pressure and preventing cross-contamination in closed-loop systems.

As an original replacement part, the RTG20319AS ensures proper fit and performance when servicing or maintaining Rheem’s direct-vent or outdoor gas-fired tankless models. The included O-ring seals the connection, minimizing the risk of leakage during operation.

Product Features

• Backflow Prevention – Maintains proper flow direction in recirculation lines, protecting system efficiency and preventing operational disruptions.
• OEM-Specific Fit – Designed exclusively for compatible Rheem models, ensuring correct installation and function without modification.
• Service-Ready Kit – Includes factory check valve and sealing O-ring for direct replacement during maintenance or repair.
• Compact and Durable – Built with non-corrosive materials to withstand continuous exposure to hot water and pressure changes.

Technical Specifications

• Part Number: RTG20319AS
• Component Type: Inline check valve with O-ring
• Application: Rheem tankless gas water heaters with integrated recirculation
• Material: Corrosion-resistant polymer and rubber (O-ring)
• Installation Location: Internal system component—consult unit service manual

Installation Notes

Installation of the check valve kit should be completed by a licensed contractor familiar with tankless water heater servicing. This is a maintenance item typically accessed during inspection or recirculation line repair. Always verify compatibility with the water heater model before replacement. A watertight seal is critical—ensure the O-ring is properly seated and free from damage or debris.

Professional Contractor Considerations

For contractors maintaining or servicing Rheem tankless systems, the RTG20319AS is a key part to have in truck stock for prompt response to backflow-related issues. Using the OEM valve preserves warranty integrity and helps avoid callbacks due to mismatched components or improper flow characteristics.