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 5905-01-204-1960
NSN 6220-00-888-7235
NSN 5935-00-035-4559
NSN 7035-00-756-4374
NSN 2925-00-402-5582
NSN 5945-00-900-3932
NSN 4140-01-288-7397
NSN 5996-01-420-1306
NSN 5835-01-325-5677
NSN 5999-01-520-8654
NSN 6645-01-488-5466
NSN 6645-00-456-2219