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 4140-01-447-4826
NSN 5990-00-403-9768
NSN 5935-01-610-5443
NSN 5975-01-166-7551
NSN 6150-00-226-1868
NSN 5950-00-584-4571
NSN 5960-01-315-6993
NSN 6320-00-931-4855
NSN 5960-01-430-3911
NSN 6650-01-100-9964
NSN 5998-01-032-3078
NSN 6110-01-294-6416