As a veteran HVAC technician can tell you

Bradford White has updated part number prefixes

Key Benefits Dual Mounting Flexibility: Includes both foot mounting and a single threaded 1/2" hub for diverse installation requirements

as well as 1-1/4" to 2" 009M1 and 2" 009M2 models

Kunkle Valve 0548-A01-KM0030 Valve Els PW 17895 As a veteran HVAC technicianThe Kunkle Valve 0548 A01 KM0030 is a high capacity ASME Section VIII air gas pressure relief valve designed for demanding industrial environments. Built with a rugged brass body and a stainless steel ball seat, this valve ensures superior tightness and durability in compressed air systems. It features a 1 4" male NPT inlet and is factory set at 30 PSI with a flow capacity of 43 SCFM. This model serves as the primary AL 412 replacement valve, offering