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 6145-01-354-4753
NSN 5915-01-181-5603
NSN 6240-01-236-4423
NSN 5990-00-212-4316
NSN 6130-00-518-1723
NSN 6145-01-305-0367
NSN 6220-01-100-2703
NSN 5925-01-022-5094
NSN 5930-00-889-6535
NSN 4140-01-131-6608
NSN 5999-00-494-9224
NSN 5965-01-453-7504