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 6150-01-225-3629
NSN 6320-00-149-7570
NSN 5950-01-556-7989
NSN 6650-00-475-2140
NSN 6150-00-670-4055
NSN 4140-01-379-3986
NSN 5915-00-917-1725
NSN 6145-01-473-1698
NSN 6240-01-215-8485
NSN 5990-01-013-4569
NSN 6620-00-632-3631
NSN 5925-00-216-4480