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 5895-01-086-8859
NSN 6650-01-303-7763
NSN 5960-01-310-2529
NSN 5975-00-218-0414
NSN 6320-00-115-0883
NSN 6130-01-545-5678
NSN 6685-00-734-6573
NSN 5915-01-044-5260
NSN 6685-00-799-9685
NSN 6150-00-869-8785
NSN 6110-01-400-4207
NSN 5835-00-632-8621