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 2925-01-574-0273
NSN 4140-01-348-9029
NSN 6240-01-370-3896
NSN 5950-00-646-9176
NSN 6240-00-997-2025
NSN 6620-01-630-3494
NSN 5930-01-519-7596
NSN 5895-01-541-8249
NSN 6320-01-249-3236
NSN 5905-00-900-7795
NSN 5910-01-633-2988
NSN 6620-00-189-0967