4.000 in. Size
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 6645-00-868-6720
NSN 6135-01-036-3495
NSN 5965-01-540-0743
NSN 5905-01-008-2638
NSN 5910-00-668-4582
NSN 5855-01-495-1111
NSN 5935-00-584-4584
NSN 5960-01-173-7956
NSN 5925-00-597-1558
NSN 6110-01-345-8240
NSN 5950-00-602-7230
NSN 6650-01-013-3243