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 5920-00-968-8004
NSN 6145-01-019-0773
NSN 5930-01-519-2821
NSN 5925-01-310-8456
NSN 5996-01-344-2160
NSN 6645-00-583-0066
NSN 6610-00-951-4451
NSN 6620-01-423-7300
NSN 6610-01-428-3587
NSN 5945-01-155-2018
NSN 5999-00-604-9669
NSN 5996-01-586-5270