As an OEM Williams furnace part

While optimized for HVAC zoning

low-resistance "make-and-break" connection

this thermostatic expansion valve provides the accurate superheat control necessary to maximize evaporator efficiency and protect the compressor from liquid slugging

As a veteran-grade HVAC temperature limit switch

Trane SWT1718 Pressure Switch 318423-701 As an OEM Williams furnaceThe Trane SWT1718 Pressure Switch is an essential OEM safety component designed for precise monitoring of refrigeration circuit pressures in Trane and American Standard HVAC systems. This low pressure cutout switch features a single pole single throw (SPST) contact configuration, factory calibrated to open at 7 PSI and close at 22 PSI. Constructed with a direct mount design and 0. 25 inch female flare (FFL) terminals, it ensures a secure, leak free