Style SEMJ Flex-Rubber Expansion Joints are manufactured using heat resistant chlorobutyl and high strength polyester reinforcement. End fittings are full face rubber, with 150# carbon steel back-up flanges. Joints have a wide arch configuration and are available in other elastomers for special applications. Working pressures up to 150 psi. Temperatures up to 250°F. Standard sizes range from 2" through 24" I.D.