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 4140-01-311-0076
NSN 5920-01-029-3813
NSN 6105-01-157-5474
NSN 5915-01-490-9864
NSN 5855-00-361-0167
NSN 6645-01-430-4125
NSN 5998-01-571-9070
NSN 5895-01-014-6511
NSN 5855-01-027-1571
NSN 4140-01-012-2460
NSN 5996-00-298-1932
NSN 2925-01-509-3783