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 6220-01-599-1993
NSN 5960-00-493-5589
NSN 5960-01-347-0751
NSN 5985-00-948-3491
NSN 5925-00-932-0106
NSN 5999-00-288-3143
NSN 6240-00-372-4841
NSN 6610-01-032-7585
NSN 5999-00-848-2270
NSN 5965-01-013-0290
NSN 4140-01-065-0314
NSN 5915-00-184-7664