Used Pin Firestone 9/16-18 Gas Keg Post
May or may not include used poppet valve and used o'ring.
These posts are for Firestone kegs
Firestone and Hoover have a different thread size on the gas and liquid side (post may be stamped with writing and "HANSEN"). The Cornelius and AEB thread sizes for gas & liquid are the same, but different than Firestone/Hoover (typically no stamp on post).
These are for Pin Lock kegs and cannot be used on Ball lock kegs for converting them over to Pin lock kegs because they are different thread size.