Imo low pressure pump
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 6240-01-085-6576
NSN 6320-01-286-7535
NSN 6145-01-232-4253
NSN 6135-01-032-8887
NSN 6650-01-513-2644
NSN 5920-00-008-0579
NSN 5925-01-634-0664
NSN 5960-01-469-1684
NSN 5965-01-263-7636
NSN 5905-01-270-6113
NSN 6240-00-064-4064
NSN 5990-01-387-3820