I have a fair amount of Cornie Poppets for sale. They are the universal ones so can fit any Cornie keg be it Firestone, etc, etc. I've had some issues with my used cornie kegs in the past so bought a batch of these to fix the issue, also handy to have a spare set on hand in case you get an unexpected leak.
This is the blurb form an american website:
This universal poppet valve fits virtually all ball-lock kegs, and most pin lock kegs. Includes a stronger than normal spring for a positive seal. 1 and 1/8" long when uncompressed.
Note: You may need to cut a coil or two off the bottom of this poppet valve make this poppet fit certain applications, if you find it is too hard to press down the center poppet when installing a ball or pin lock fitting. This is easy to do with wire cutters
They are £2.50 per poppet plus postage (73p).
I will put an order in this week. They're coming from abroad so expect a few weeks wait. I won't take payment until they arrive.
Cheers
Lee