Oring size kral puncher breaker

If memory serves me correctly,the fill probe o'ring is a #9. I had to radius the edges on my fill port with some 400 them 600 grit wet/dry paper to reduce the chance of damage to the o'rings (be sure to add a little silicone grease to them). I have a pic of a little doo-dad that I use on my probes to keep crap off of them. Just a vacuum line plug.
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As far as the barrel o'ring,the only place I've found the right size so far is at Pyramyd.

Hope this helps Ya!

Mike