the 138-18-021-01 is a direct OEM replacement part that fits perfectly within the pilot assembly

This spring is rated for 3" to 8" water column (WC)

it restores circuit continuity once temperatures drop back to safe operating levels

as well as 2313HLS and 2413HLS high leverage drainers

Operating on an open on rise switch action

Williams P320758 Pilot the 138-18-021-01 is a directThe Williams P320758 Pilot is a critical OEM furnace replacement part designed for precision ignition in Williams wall furnaces and high performance heating systems. Engineered with a winged deflector, this pilot burner assembly ensures a targeted flame pattern, essential for maintaining constant contact with the thermocouple or pilot generator. This specific configuration prevents common nuisance outages by stabilizing the flame against internal air