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 5905-01-128-7972
NSN 7035-01-557-9714
NSN 6150-01-218-1767
NSN 5835-00-350-3703
NSN 5990-00-711-9890
NSN 5996-01-585-0094
NSN 6610-00-225-9886
NSN 5915-00-426-8298
NSN 6220-01-258-1283
NSN 6220-00-067-7645
NSN 6145-01-430-2784
NSN 5998-00-202-5380