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 4140-01-604-8073
NSN 6110-01-010-0905
NSN 5925-00-928-1589
NSN 5996-01-257-0265
NSN 5996-01-386-2843
NSN 5895-01-241-7626
NSN 5999-01-430-4997
NSN 5960-01-512-0233
NSN 5965-01-386-2988
NSN 5935-00-080-9940
NSN 6220-01-369-9015
NSN 6220-00-906-0678