A-71504287-AI Expan.ValveOne New Aftermarket Replacement Expansion Valve for Deutz, Deutz Fits Allis, Fits Allis Chalmers, and Hesston Tractors This aftermarket A C expansion valve regulates refrigerant flow from the high pressure liquid line into the evaporator core, controlling cooling capacity in the cab air conditioning system. Compatible with both R12 and R134a refrigerant systems. The valve uses O ring fittings at all four ports and connects the A C lines to the