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 5998-01-584-2949
NSN 5905-01-209-6737
NSN 5930-00-104-1470
NSN 6240-00-318-7162
NSN 6320-01-573-6490
NSN 5996-00-707-6228
NSN 5990-00-465-4903
NSN 4140-01-634-0330
NSN 5999-00-604-5005
NSN 6650-00-575-7487
NSN 6320-01-078-8257
NSN 2925-00-756-8510