Watts 0275464 Valve 326010-701 It is the designated replacement

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

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

the desiccant blend used in this 16 cubic inch core is compatible with both POE and mineral oils

As an original equipment manufacturer (OEM) part

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