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 5910-00-226-8109
NSN 5975-01-505-2773
NSN 5945-00-615-9218
NSN 5930-01-650-1555
NSN 5910-00-335-8586
NSN 6110-01-592-3572
NSN 4140-01-164-4935
NSN 5930-01-381-5528
NSN 6620-01-649-5570
NSN 5930-00-590-7990
NSN 5998-00-422-5538
NSN 6220-00-402-7562