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 6145-00-715-5262
NSN 6645-00-221-7071
NSN 5975-01-123-9111
NSN 5835-01-295-2431
NSN 4140-01-168-5137
NSN 6110-01-350-7986
NSN 2925-01-318-8853
NSN
NSN 5930-01-126-6492
NSN 5960-01-224-7151
NSN 5945-01-445-5941
NSN 2925-00-973-9413