GM Genuine Parts HVAC Heater Hose Connectors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These connectors are quick-connect fittings that are fitted to the heater hose ends. The HVAC heater hose connector allows coupling of the hose to the heater core and valve(s) and to the engine. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).