Miniature Threaded Check Valves from O'Keefe Controls Co.
Threaded check valves in small sizes are available in brass or stainless steel construction and produced in sizes: 6/32, 10/32; 1/4*20 and 5/16*18. Corresponding metric sizes are M3.5, M5, M6 and M8. Valves are suited for liquid or gas service.