3-PLY SILICONE COOLANT HOSE, MEETS OR EXCEEDS OPERATING REQUIREMENTS OF SAE J20 R1, MEETS OR EXCEEDS OPERATING REQUIREMENTS OF TMC RP303B CLASS I GRADE II, WORKING PRESSUSRE IS 1/3 OF THE BURST PRESSURE, IDEAL FOR EXTREME TEMPERATURE AND VARIOUS PRESSURE RANGES WHERE HIGH PERFOMANCE LEVELS ARE REQUIRED.