Style SEMS Flex-Rubber Expansion Joints are generally used in heating and air conditioning systems, for hot and cold water service, and for mild chemicals and oils. Manufactured using neoprene tube and cover, with a fully molded single spherical design. End fittings are 150# Zinc plated carbon steel rotating flanges, with a steel bead flange retainer. No separate retaining rings are ever required. Working pressures up to 220 psi. Temperature range is 14°F. to 230°F. Standard sizes range from 1 1/2" through 20" I.D.