Shields Marine Exhaust/Water Hose is reinforced with 2 or 4 plies of synthetic cord and is made of black, heavy-walled synthetic rubber. Primarily used for straight connections in wet exhaust systems and engine water circulation lines. Resistant to engine heat, exhaust fumes, ozone, mild chemicals, antifreeze and saltwater and has double the ozone resistance required by SAEJ2006. Temperature ranges from -20 degreesF- +200 degreesF continuous, +250 degreesF intermittent. The hose meets SAE J2006 Type R1 standards. ID 2-7/8" OD 3-7/16" Length 12-1/2'