Connection Assembly C, O-Ring Kit

O-Ring Seal Kit for Rheem Tankless Gas Water Heaters – Connection Assembly C

The Rheem RTG20319C O-Ring Kit is a factory-supplied replacement component designed for use in conjunction with Connection Assembly C on select Rheem tankless gas water heaters. This kit contains high-temperature-resistant O-rings engineered to maintain seal integrity at critical connection points within the recirculation or water connection assemblies.

Intended to restore sealing surfaces during service or reassembly, the RTG20319C ensures leak prevention at designated junctions within Rheem’s closed water heating systems. The materials are selected for compatibility with potable water, elevated temperatures, and routine thermal cycling.

Application Details

• Part Number: RTG20319C
• Function: Replacement O-rings for Rheem Connection Assembly C interface points
• Material: EPDM or equivalent elastomer, rated for domestic hot water and system pressures
• System Type: Rheem RTG-series tankless gas water heaters (check model documentation for exact compatibility)

Installation Considerations

O-ring replacement should be performed during scheduled maintenance or as part of a leak diagnosis procedure when disassembling fluid joints. Always lubricate new O-rings with an approved water-based lubricant prior to installation. Surfaces must be free of scale or scoring to ensure proper sealing. Over-compression or use of incorrect tools may result in premature gasket failure.

This kit is intended for use by licensed plumbers or technicians familiar with gas-fired tankless systems. Proper torque specifications and alignment procedures must be followed to ensure system integrity after reassembly.

Performance Attributes

• High-Temperature Rating: Designed to operate reliably in water temperatures up to 185°F (85°C)
• Pressure Resilience: Maintains sealing properties under residential and light commercial water pressure ranges
• Exact Fitment: Manufactured to match OEM groove profiles in Rheem assemblies to prevent bypass or leaks

Contractor Notes

Use this O-ring kit during installation of new accessories, scheduled service intervals, or when replacing aged connection assemblies. Replacing worn seals is critical in preventing nuisance leaks, water damage, or efficiency loss in recirculation systems. Stocking this kit in your service vehicle ensures readiness for most Rheem RTG-series service calls involving domestic water or return line connections.