Sierra Shields Marine Exhaust/Water Hose 3"Sierra Shields Marine Exhaust/Water Hose 3/4" 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.:; 3" or 76mm; O.D.: ; 3 9/16" or 90.5mm; Wt. "C": 182; Burst Pressure: 220 PSI; Working Pressure: 75 PSI; The temperature ranges from -20F - +200F continuous, +250F intermitent; This hose meets SAEJ2006 Type R1 standards; Applications: This hose is used for straight connections in wet exhaust systems & engine water circulation lines; Resistant to engine heat, exhaust fumes, ozone, mild chemicals, antifreeze, and saltwater; This hose also has double the ozone resistance required by SAEJ2006;