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 5915-01-303-7687
NSN 6650-01-379-3641
NSN 5910-01-158-9050
NSN 2925-01-035-7699
NSN 5960-01-143-1202
NSN 6130-00-114-2547
NSN 6320-01-029-4220
NSN 5975-01-527-8106
NSN 5998-01-444-2684
NSN 5985-00-212-7690
NSN 6620-01-210-9002
NSN 4140-00-179-0200