The end connection identified above as the second end is the valve inlet
A valve having an orifice in the poppet, disk, or the like, to permit restricted fluid flow when the valve is seated. It does not have a stem or provisions for pressure adjustments, and is similar to a valve, check with the exception of the orifice which permits fluid flow in more than one direction.
Classification: Check valves of materials other than copper, iron or steel
NSN 5925-01-345-3777
NSN 5920-01-127-0252
NSN 5930-00-947-6758
NSN 5895-00-945-8902
NSN 6150-01-382-0906
NSN 6110-00-153-0936
NSN 5965-01-264-8761
NSN 5945-01-034-1671
NSN 6240-00-474-5809
NSN 5965-00-246-5612
NSN 6240-01-381-8713
NSN 6130-01-260-9519