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 5835-01-013-9321
NSN 5905-01-279-0189
NSN 5945-01-368-7497
NSN 6610-01-079-8804
NSN 5855-00-198-3197
NSN 6240-00-935-7058
NSN 4140-00-735-9309
NSN 5996-00-895-9773
NSN 5998-01-506-5223
NSN 5999-01-420-7843
NSN 5999-00-074-9166
NSN 2925-00-839-6815