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 4140-00-279-3148
NSN 5950-00-952-9345
NSN 6610-00-536-4977
NSN 5975-00-045-6704
NSN 5930-01-301-4199
NSN 5915-01-371-2584
NSN 6150-01-021-8289
NSN 6105-00-816-9397
NSN 6110-01-155-7004
NSN 4140-01-195-9127
NSN 5975-01-539-3312
NSN 6620-01-364-7461