Sierra Water/Heater Hose 1/2" - BlackSierra 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 saltwater.Specifications: I.D.:; 1/2" or 12.7mm; O.D.: 13/16" or 20.6mm; Wt. "C": 19; Working Pressure: 200 PSI; Temperature ranges from -40F - +212F; Application: This hose is primarily used for engine heater hose, heat exchanger, A/C circulation, and drain lines.;