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 6150-01-431-4344
NSN 6620-00-425-7475
NSN 5920-00-541-1119
NSN 5990-01-231-1214
NSN 6145-00-266-8453
NSN 5960-01-460-0115
NSN 5999-01-024-9547
NSN 5930-00-435-1317
NSN 5935-00-902-5558
NSN 6645-01-648-4439
NSN 5915-01-158-4918
NSN 6650-01-399-8552