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 6150-01-250-2772
NSN 6130-01-442-4091
NSN 6220-01-372-7715
NSN 7035-01-058-8728
NSN 5925-01-658-8747
NSN 5835-01-654-1251
NSN 5998-01-582-3112
NSN 5999-01-290-3925
NSN 5905-00-703-1902
NSN 5905-01-174-0101
NSN 6220-01-240-1108
NSN 6620-00-290-6505