Lochinvar & A.O. Smith 100163257 Bypass Assembly 318973-401 What does the TDR do

What does the TDR do for the homeowner

it should only be installed in specific models where the internal electrical and pressure requirements match the unit's original factory specifications

Reduces Vibration and Fan Rub: Minimizes operational noise and mechanical stress on components

High Pressure Rating: Robust brass body construction safe for 650 PSI

Using the genuine Reznor 131448 prevents torque-induced flexing that leads to belt wear and motor failure

Lochinvar & A.O. Smith 100163257 Bypass Assembly 318973-401 What does the TDR doThe Lochinvar & A. O. Smith 100163257 Bypass Assembly is a critical OEM component engineered for precise flow management in high efficiency pool and spa heating systems. Built to withstand the rigorous demands of commercial and residential hydronic applications, this 1 2" NPT bypass kit ensures optimal heat exchanger performance by regulating water velocity and preventing thermal shock. This assembly is a direct replacement part designed specifically