White Rodgers NBE 2DA-01 Heat Exchangers NXT-R SERIES THERMOSTATIC EXPANSION VALVE, REFRIGERANT CODE D (R-450A, R-513A), CHARGE CODE A (MED & LOW TEMP), 2 TON, 3/8" X 1/2" ODF STRAIGHT THRU, SUPERHEAT ADJUSTABLE, NO INTERNAL CHECK, EXTERNAL EQUALIZER, NO BLEED, CAP TUBE 30"