The Gates 18126 HVAC Molded Heater Hose is a specific coolant hose designed for use in engine cooling systems of cars and trucks. It is manufactured by Gates, a well-known brand in the automotive industry. This molded heater hose is designed to efficiently transport coolant to and from the heater core, helping to regulate the temperature inside the vehicle. With the manufacturer part number 18126, this hose is a reliable component for maintaining proper functioning of the heating and cooling systems in vehicles.