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 5999-01-207-3558
NSN 5930-01-473-2395
NSN 5930-01-655-3822
NSN 6320-01-592-6248
NSN 6220-01-634-0660
NSN 6645-01-133-8359
NSN 5990-00-594-7291
NSN 5945-00-104-8097
NSN 5999-01-055-6571
NSN 6240-01-083-4697
NSN 6645-01-352-5675
NSN 6240-00-932-1331