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 6220-01-308-0414
NSN 7035-00-126-1899
NSN 5960-01-420-1251
NSN 6610-01-461-8180
NSN 6645-01-394-5149
NSN 5975-01-487-3748
NSN 5915-00-122-4849
NSN 6685-00-654-9912
NSN 6135-01-633-8502
NSN 5975-00-150-6400
NSN 6645-01-192-4079
NSN 5920-00-178-1688