A relatively thin metallic item, having a concave or cupped contour, designed to effect its own seal by compression against the circumference of a hole. It is used as a blowout plug in boilers, engines, and the like to relieve the pressure created by the expansion of fluids caused by heat or freezing.
Classification: Parts for steam or other vapor generating boilers and super-heated water boilers, except heat exchangers
NSN 5905-01-222-0927
NSN 5935-01-380-3446
NSN 5985-01-181-9799
NSN 5998-01-156-7379
NSN 6145-00-959-5897
NSN 6610-01-429-2162
NSN 5960-01-063-6846
NSN 5999-00-414-5282
NSN 5910-00-958-0414
NSN 4140-00-193-0067
NSN 5920-01-191-6321
NSN 6135-00-016-0071