Watts 0275464 Valve 326010-701 It is the designated replacement

It is the designated replacement for legacy models including the P45NCA-46

When should the pre-filter be replaced instead of washed

Smith 100208400 Pressure Switch is a critical OEM safety component engineered for high-efficiency condensing boilers and commercial water heaters

Rigid Construction: Manufactured to withstand the thermal stress and vibrations of power-vented water heaters

Watts 0275464 Valve 326010-701 It is the designated replacementProfessional grade Watts 0275464, a high capacity Series 174A boiler pressure relief valve, is engineered for critical overpressure protection in large scale hot water heating and domestic supply systems. Constructed with a heavy duty bronze body and a rugged stainless steel spring, this 1 inch NPT valve is factory set to a 150 psi pressure relief setting and delivers a high volume discharge capacity of 3,795,000 BTU hr. The 174A series utilizes a non