Sierra Water/Heater Hose 3/4"Sierra 1300 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.:; 3/4" or 19.1mm; O.D.: 1" or 25.4mm; Wt. "C": 26; Working Pressure: 50 PSI; Temperature ranges from -40F - +212F; Application: This hose is primarily used for engine heater hose, heat exchanger, A/C circulation, and drain lines;