White Rodgers AAE 4BA-01 Heat Exchangers A-SERIES THERMOSTATIC EXPANSION VALVE, EXTERNALLY EQUALIZED, 4 TON CAPACITY, REFRIGERANT CODE B (R-448A AND R-449A), CHARGE CODE A (WIDE RANGE), CAP. TUBE 30", 3/8" ODF X 1/2" ODF, STRAIGHT THRU BODY