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The RHEEM rtg20319c is a factory-supplied O-ring kit designed to restore seal integrity at critical connection points within Connection Assembly C on select Rheem tankless gas water heaters. This kit contains high-temperature-resistant O-rings engineered to maintain leak-free performance at recirculation and water connection assemblies. It is a direct OEM-sourced replacement component intended for installation by licensed plumbers and HVAC technicians performing service or repair on Rheem tankless units. Proper sealing at these connection points is essential to safe operation and long-term heater performance.
This kit is applicable to select Rheem tankless gas water heater models that incorporate Connection Assembly C. It is typically used during routine maintenance, after a connection assembly replacement, or when O-ring degradation has caused leaking at water inlet or recirculation ports. Service technicians should verify the specific assembly designation on the unit before ordering to confirm fitment.
Designed as an OEM-style replacement for select Rheem tankless gas water heater models equipped with Connection Assembly C. Verify the connection assembly designation on the specific unit before installation.
Installation should be performed by a licensed plumber or qualified HVAC technician. Shut off the cold water supply and disconnect power or gas to the unit before beginning any service work. Inspect mating surfaces for debris or damage before seating new O-rings, and avoid pinching or twisting O-rings during installation. Refer to the applicable Rheem service documentation and local plumbing codes for guidance.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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