This valve uses 1/4" barb connections for the common and normally closed ports

Its robust construction resists mechanical vibration

the RS series is not intended for dead-end lockup service

and C2500 series heaters

Experienced contractors know that reliability in the field depends on using exact-spec components

Lochinvar & A.O. Smith 100163255 Kit R-410A This valve uses 1/4" barbThe Lochinvar & A. O. Smith 100163255 Air Inlet Kit is a critical OEM component designed to provide regulated, clean combustion air to high efficiency residential and commercial heating systems. Engineered specifically for compatibility with Lochinvar Knight and A. O. Smith boiler and water heater models, including the KB 500 and AW 501 series, this kit ensures the burner receives the precise oxygen volume required for optimal stoichiometric