131V Ultimate Silicone heater hose – Very Hi Temp Blue with Red Tube provides much greater Temp. range and service life than standard EPDM rubber #130 Heater Hose. 131V is 2 spiral polyester reinforced with similar working pressure for engine coolant water, A/C and other mid-press water applications. 45 to 75 PSI (0.31 to 0.52 Mpa) WP 350°F (177°C) SAE J20R3, Class 1 & J20 P3. 7 Year Warranty.