BT5-4757 is a Sanden SD7H15HD style A/C compressor for Volvo, Navistar, and heavy-duty mobile HVAC applications. It features a 12V clutch, PV6 6-groove serpentine pulley, 125mm clutch diameter, WV back head, direct long mount, rear pad O-ring fittings, PAG100 oil, and R134a refrigerant compatibility. Cross references include Sanden 4494, Sanden 4757, Sanden 4891, MEI 5387, Volvo 20501069, Red Dot 75R81372, and TruckAC+ T4676.