No. Of external grooves-12 that are 0.010 in. W; trapped cup opening-0.279 in. Long with 0.352 in. Id; dyed red for oversize
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 5895-00-248-2392
NSN 6240-01-099-8826
NSN 5965-01-411-7667
NSN 6650-01-623-3078
NSN 5915-01-406-3847
NSN 6150-00-338-8953
NSN 6620-00-861-3828
NSN 6150-00-423-3543
NSN 6650-00-157-1691
NSN 6620-01-078-6372
NSN 5935-01-446-0264
NSN 6220-00-330-3717