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 4140-01-238-1373
NSN 5965-01-509-8178
NSN 5998-00-011-1816
NSN 5930-01-472-3532
NSN 5960-01-599-9821
NSN 5985-00-097-4034
NSN 5855-01-115-9014
NSN 6620-01-406-6840
NSN 5960-00-186-6344
NSN 6240-00-266-6258
NSN 6135-01-600-8345
NSN 5835-01-178-4154