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 5920-01-221-0510
NSN 6240-01-546-9756
NSN 6645-00-664-4665
NSN 5950-01-417-3119
NSN 5990-01-605-4769
NSN 5960-01-447-0169
NSN 5998-01-394-7661
NSN 6145-00-182-2865
NSN 5999-01-301-4805
NSN 5905-01-176-0613
NSN 5998-01-370-9051
NSN 5965-01-399-8454