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2-Way - Cast CF8M Bodies - Packless, Normally Closed Or Normally Open - Full Port, Pressure: 5 psi differential minimum to 150 psi maximum, Bonnet Assemblies are 304 SS Tubes welded into 303 SS or CF8M SS Bonnet, with 303 SS Tube Plugs. Piston Assemblies contain 303 SS SeatScrew Assemblies in the 303 SS Piston with Filled Teflon™ Piston Rings and 316 SS Expanders. Viton® Seat Discs held in place by 303 SS DiscScrews or CF8M GuideNuts. Piston Springs are 316 SS. SeatScrew Assemblies are Viton® Slugs in a 304 SS SeatScrew, held in place with a 316 SS Retainer.