fittings are typically sized by the Outside Diameter (OD)

Can I use this contactor for a 1

Universal Mounting Hardware: Includes adapters to accommodate various legacy mounting hole patterns in older furnace models

The Lennox 18K44 Limit Switch is a high-reliability OEM replacement normally closed safety control designed for precise thermal management in residential gas furnaces and air handlers

including 21-957

Schneider Electric (Erie) 100-082 Repair Kit Els PW 17895 fittings are typically sized bySchneider Electric (Erie) 100 082 Valve Repair Kit for 1" NPT and 1 1 4" Sweat Two Way General and Steam Service PopTop Series Valves with 8. 0 Cv