We offer bulk coolant hose from Dayco and Purosil in many lengths. The most popular bulk coolant is 3/4 and 5/8 inch heater hose. We offer bulk coolant hose in fabric reinforced EPDM rubber and also in silicone. Bulk coolant hose is used as a connection between the radiator and the block and the heater core and other components in the cooling system. This hose provides high burst strength and resistance to breaks and buckling at connections. Another important use for bulk coolant hose is to maintain full flow of coolant for engine protection.