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 6220-01-174-2035
NSN 6110-01-120-1087
NSN 6240-01-465-6485
NSN 5998-00-327-8788
NSN 5930-01-413-1004
NSN 5930-01-526-0914
NSN 5925-01-506-5306
NSN 6150-01-037-8560
NSN 6645-01-393-5128
NSN 5960-00-081-1937
NSN 5950-00-378-9959
NSN 6105-01-521-4575