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2-Way - Cast Bronze Bodies - Packless, Velvetrol® Internal Piston Pilot Operated Solenoid Valves, For: General Service air-inert gases-water-oil-steam, Temperature: -420°F min to 450°F max fluid, Class F or N coils are waterproof, fungus proof, molded of filled polyester with 18" leads in NEMA 1 enclosures with 1/2" conduit connector. Piston assemblies contain brass SeatScrews in the brass Pistons with filled Teflon™ piston rings, stainless steel expanders, and Buna Seat Discs. Piston Springs are 316 or 302 SS. SeatScrew Assemblies are Buna Slugs in a brass SeatScrew, held in place with a brass Retainer.