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 5920-01-442-0732
NSN 5910-01-560-7804
NSN 6650-01-585-5775
NSN 5895-01-340-9822
NSN 5910-01-299-9754
NSN 6135-00-078-9931
NSN 6220-00-548-1999
NSN 5855-00-189-6066
NSN 5960-01-336-4239
NSN 6130-01-535-6564
NSN 6240-00-655-2523
NSN 5985-01-623-0661