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 6645-01-188-2918
NSN 5835-01-028-7009
NSN 5965-01-012-1065
NSN 5910-01-401-5279
NSN 5905-00-177-7833
NSN 5920-01-271-2304
NSN 5925-01-023-5398
NSN 5960-00-311-8787
NSN 6135-01-386-5709
NSN 6240-01-418-5021
NSN 5985-00-991-3546
NSN 5998-01-515-7441