The water channealsoer known as a coolant gulf or indoor regulator, is the portion of the motor that permits coolant to enter from the radiator. It is a rule interface to the upper radiator hose and houses the indoor regulator, which directs the stream of coolant based on the engine’s temperature. Made from metal or tough plastic, the water gulf must withstand high temperatures and we... https://www.thervrepair.com/water-inlet/