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 4140-01-580-3291
NSN 5920-01-383-0300
NSN 6240-00-079-0112
NSN 6650-01-022-0078
NSN 5935-01-526-6561
NSN 5945-01-340-4972
NSN 5895-01-467-6375
NSN 5945-01-429-9824
NSN 4140-00-464-7890
NSN 5996-01-445-5528
NSN 5965-00-181-0213
NSN 6145-01-392-4683