MRCOOL H4TXV01 Signature Series 1.5 to 2.5 Ton Thermostatic Expansion Valve Kit is a refrigerant control component designed to optimize the performance of compatible HVAC systems. It works by sensing the evaporator outlet temperature and automatically regulating refrigerant flow to maintain proper superheat, improving heat transfer and protecting the compressor. Designed for use with ... https://www.partshnc.com/mrcool-signature-txv-h4txv01