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 5905-01-451-4205
NSN 2925-01-527-1207
NSN 5920-01-388-7293
NSN 7035-01-412-8322
NSN 6220-01-204-3575
NSN 5905-01-549-4406
NSN 6620-00-838-6954
NSN 5855-00-357-1158
NSN 6150-01-422-4686
NSN 6685-01-537-2785
NSN 6685-01-614-6562
NSN 6150-00-856-3789