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 5920-01-206-0191
NSN 5965-01-538-8795
NSN 5930-00-654-3311
NSN 6645-01-484-9847
NSN 4140-01-625-2258
NSN 5985-00-935-8653
NSN 2925-01-426-3410
NSN 5996-01-252-5777
NSN 6145-01-352-0703
NSN 5996-01-069-8576
NSN 5990-00-232-3965
NSN 6110-01-062-0252