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 6220-01-505-0538
NSN 5996-01-176-6373
NSN 5950-00-249-9146
NSN 5960-00-455-0817
NSN 5985-01-276-2469
NSN 5935-00-185-1446
NSN 5960-01-048-8228
NSN 6105-01-055-8187
NSN 5895-01-526-4481
NSN 6240-00-156-1607
NSN 5998-00-459-5842
NSN 6620-01-420-1735