White Rodgers NBE 1/2MC-04 Emerson NXT-R SERIES THERMOSTATIC EXPANSION VALVE, REFRIGERANT CODE M (R-134A), CHARGE CODE C (MED. TEMP), 1/2 TON, 1/4" X 1/2" ODF STRAIGHT THRU, SUPERHEAT ADJUSTABLE, NO INTERNAL CHECK, EXTERNAL EQUALIZER, NO BLEED, CAP TUBE 60"