The Wayne 21854 features a 1/2 inch bore (shaft size)

Key Benefits Precise Superheat Regulation: The Z-charge is optimized for low-temperature suction pressures

While the 009M2 and 009M3 share some body characteristics

ensuring proper natural gas pilot burner positioning relative to the main burner

018" orifice intended exclusively for natural gas applications

Heil Quaker ICP 1192716 Pressure Switch Els PW 17895 The Wayne 21854 features aThe Heil Quaker ICP 1192716 Pressure Switch is a high altitude safety component designed for precision atmospheric monitoring in residential and commercial furnaces. As an OEM replacement for 1014826, this switch is critical for proving proper inducer motor draft before the ignition sequence begins. When operating at elevations above 2,000 feet, standard pressure switches may fail to close due to lower air density; the 1192716 HI ALT pressure switch