Blue Silicone Heater Radiator Coolant HoseMeeting the standard SAE J20R3 Class A, TMC RP303BISO 1307 – 1997 Temperature range: -65F (-54C) to 350F (178C) Wall thickness 3/16″ (5mm) Internal diameter (I.D.):1/4″, 3/8″, 1/2″, 5/8″, 3/4″, 1″, 1¼», 1½» – 2 play2″, 2½», 2¾» 3″ – 4 play Maximum pressure:1/4″, 3/8″, 1/2″, 5/8″, 3/4″ – 200 PSI1″, 1¼», 1 1/2″ – 120 PSI2″, 2½», 2¾», 3″ – 100 PSIBurst pressure: 300PSI We do not accept the return of cut-to-length hoses ordered by the buyer.Make sure you order the correct diameter and length hose. Warranty one year.