Valve size 4.000 in.
A valve permitting flow in one direction only. It does not have a stem, except when equipped with a lever and weight and has no pressure adjustment. It may be inline or cartridge (manifold) design.
NSN 6610-01-633-8931
NSN 6320-00-925-0558
NSN 6610-01-395-9324
NSN 5985-01-061-8957
NSN 5965-00-905-6895
NSN 6240-01-531-3422
NSN 6620-01-506-5418
NSN 5999-01-016-1303
NSN 5910-01-308-6295
NSN 6645-01-504-3394
NSN 5915-01-442-6711
NSN 5965-00-578-1438