Sierra Shields Marine ExhaustWater Hose 1-12 Sierra Shields Marine ExhaustWater Hose 34 is made of black, heavy-walled synthetic rubber. The hose is resistant to engine heat, exhaust fumes, ozone, mild chemicals, antifreeze, and saltwater. Features Reinforced with 2 plies of synthetic cord Made of black, heavy-walled synthetic rubber Specifications I.D. 1 12 or 38mm O.D. 1 1516 or 49mm Wt. C 70 Burst Pressure 220 PSI Working Pressure 75 PSI The temperature ranges from -20F - 200F continuous, 250