Trident Rubber Silicone 45 Degree, 10" ID blended rubber marine wet exhaust connections. They are molded of Very High temperature blue silicone EPDM blended rubber with a smooth bore and cover; except elbows of 60 I.D. or larger have molded reinforcing ribs on the outside. These elbows have excellent resistance to ozone, salt water, diesel fumes and splash, cold, heat, and aging. Exceeds (SAE J2006-R1, and ABYC & NMMA P-1) exhaust standards. Blue Very High Temp silicone blended with EDPM Rubber 3500F (1770C) max continuous.