I think its an old Taylor Ice-cream machine keg.
They are a weird made for brand post, never found spare parts for them. Have had to weld a socket on to take a 1/2" Australian style "Turret" post, but that was years ago, these days there might be more options.
If you can find a good industrial supply or engineering shop they should be able to match the thread which might make it easier to find parts.
Can you service the existing post, it should be either a poppet or a serviceable post like the Oz ones.
Mark
I think it's a Taylor keg Bdogg. Check this thread.
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