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 5975-01-364-0312
NSN 5930-01-433-1606
NSN 6130-01-345-1727
NSN 7035-00-763-6180
NSN 5930-01-312-2596
NSN 5998-01-634-0604
NSN 5905-00-234-6205
NSN 6685-01-410-3456
NSN 6150-00-278-7070
NSN 6220-00-391-1076
NSN 6620-00-943-0449
NSN 4140-00-191-1236