For 5/8" or 7/8" suction lines

the P100AP-4 pressure switch is cross-compatible with the P100AP-4C

75-inch plated spring is compatible with natural gas

always verify the 1/2" NPT tapping size and temperature range against your specific boiler’s manual to ensure proper aquastat compatibility

including many YK and YT series centrifugal units

Nordyne M0036021R Wire Harness 324846-701 For 5/8" or 7/8" suctionThe Nordyne M0036021R Wire Harness is a critical OEM replacement part engineered for professional grade reliability in Nordyne HVAC equipment. Designed to maintain the integrity of electrical pathways, this harness is compatible with a wide range of furnace and air handler configurations, including Sow, B, 90, T, Vs, and Df models. As a genuine furnace wire harness, it eliminates the continuity risks and high resistance connections often associated