GM GENUINE 1550568
Fits MFI; Heavy Duty Heater (C42), Air Conditioning; Manual Controls (C60); 4.0MM ID HOSE, 3 PORTS, CHECK VALVE, CODE 6648,3271or TBI; Heavy Duty Heater (C42), Air Conditioning; Manual Controls (C60); 4.0MM ID HOSE, 3 PORTS, CHECK VALVE, CODE 6648,3271