Sierra Water/Heater Hose 1/2"Sierra 1350 Water/Heater Hose is fabric reinforced and has an EPDM tube and cover. The hose is resistant to mild chemicals, heat, cold, ozone, and saltwaterSpecifications: I.D.:; 1" or 25.4mm; O.D.: 1 3/64" or 36.6mm; Wt. "C": 52; Working Pressure: 150 PSI; Temperature ranges from -40F - +212F; Application: This hose is primarily used for engine heater hose, heat exchanger, A/C circulation, and drain lines;