Flexible Coupling is designed for use in a variety of general piping applications of moderate or high pressure services. Working pressure is usually dictated by the wall thickness and rating of the pipe being used. The Model 7707 couplings feature flexibility that can accommodate misalignment, distortion, thermal stress, vibration and noise and also resist seismic tremors. The utilization of Model 7707 couplings can accommodate a curved layout. See Typical Applications Flexible Couplings on Shurjoint cut sheet #B-19. The Model 7707 couplings are comprised of two housing segments, EPDM gaskets and plated track bolts and nuts. Housing segments are supplied with our standard painted finishes, i.e. orange or RAL3000 red. Optional finishes such as hot dipped zinc galvanized and epoxy coatings are also available. The Shurjoint 7707 couplings should always be installed so that the coupling bolt pads make metal to metal contact. Grade “E” EPDM (Color code: Green stripe). Temperature Range: -30° to 230° F. Not recommended for petroleum oils, minerals oils, solvents and aromatic hydrocarbons. Good for cold & hot water up to +230° F. Also good for services for water with acid, water with chlorine, deionized water, seawater and waste water, dilute acids, oil free air and many chemicals. EPDM gaskets for water services are not recommended for steam services unless couplings or components are accessible for frequent gasket replacement.