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 5960-00-138-7774
NSN 5905-00-035-5252
NSN 5985-01-621-3201
NSN 6220-01-353-0835
NSN 6620-00-181-6391
NSN 5925-01-425-5903
NSN 6685-01-625-0029
NSN 6650-01-576-1545
NSN 5996-00-248-7061
NSN 6135-01-297-5565
NSN 6150-01-598-0375
NSN 6620-00-728-3445