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 5975-00-951-0223
NSN 5975-01-319-8212
NSN 5920-00-917-6586
NSN 4140-01-103-7089
NSN 5935-01-261-3110
NSN 5910-01-043-9269
NSN 5935-00-618-0209
NSN 6620-00-001-1398
NSN 4140-01-129-2239
NSN 5999-01-268-1461
NSN 5996-01-515-6895
NSN 5998-01-335-6480