Sierra Water/Heater Hose 5/8″ Sierra1300 Water/Heater Hose is fabric reinforced and has an EPDM tube and cover. The hose isresistant to mild chemicals, heat, cold, ozone, and saltwater Specifications: I.D.: 5/8″ or 15.9mm Bend Radius: 7/8″ or 22.3mm Wt. “C”:21 Working Pressure:62 PSI Temperature ranges from -40F – +212F Application: This hose is primarily used for engine heater hose, heat exchanger, A/C circulation, and drain lines