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 6240-00-166-2271
NSN 6135-01-463-7077
NSN 5960-00-281-0824
NSN 5930-01-331-8702
NSN 6645-01-171-4528
NSN 5855-01-261-4677
NSN 5930-00-570-0843
NSN 5950-01-223-9288
NSN 6135-01-601-8657
NSN 5920-01-148-1042
NSN 5925-01-606-8674
NSN 6135-01-391-8539