5/8" x 50' EPDM Black Heater Hose. It is an OEM reinforced hose similar to Class D2 SAE 20R3. The hose is made of EPDM rubber and is reinforced with a synthetic fabric. It has a maximum working pressure of 150 psi and a temperature range of -40°F to 250°F. It is suitable for use with hot water, antifreeze, and other non-corrosive fluids.