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 5975-01-246-3874
NSN 6645-00-006-6387
NSN 6220-01-353-7777
NSN 6320-00-456-2092
NSN 7035-01-113-1424
NSN 4140-01-233-5230
NSN 5950-00-675-8972
NSN 6145-01-462-1120
NSN 5835-01-424-4577
NSN 6650-00-440-3537
NSN 6650-01-056-6043
NSN 6685-01-094-6334