The Rinnai 104000286 Water Heater Sensei Bypass Valve Assembly regulates water flow through the bypass line in compatible tankless water heater systems. This valve assembly operates by directing water through the designated internal passage, supporting proper water circulation and temperature regulation during heater operation. Installed within the water heater’s plumbing system, it w... https://www.hnkparts.com/104000286-rennai-bypass-valve-replacement-kit-s/4-104000286.html