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 4140-01-165-6409
NSN 5960-01-269-6045
NSN 6620-00-226-2285
NSN 5998-01-359-1944
NSN 6645-00-764-3355
NSN 5925-01-265-0832
NSN 5960-01-353-3302
NSN 5975-01-120-9810
NSN 5915-01-420-7767
NSN 5990-01-623-0082
NSN 5945-01-591-3296
NSN 5965-00-013-7990