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 6220-01-390-7341
NSN 6685-01-606-9171
NSN 7035-01-150-6303
NSN 6150-00-925-1005
NSN 5960-00-018-3477
NSN 5945-00-526-0310
NSN 6610-01-551-0774
NSN 5905-00-060-1776
NSN 5855-01-050-0861
NSN 6645-01-059-2712
NSN 4140-01-539-3401
NSN 5960-01-308-2474