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 5960-01-353-3302
NSN 6105-00-433-2759
NSN 5999-01-147-1022
NSN 4140-01-400-3610
NSN 2925-00-149-0760
NSN 5895-00-387-4901
NSN 5935-00-948-5957
NSN 6220-00-231-0708
NSN 6610-01-296-4462
NSN 6610-01-074-1289
NSN 5835-00-711-3371
NSN 5855-00-156-5489