Are you using BP, Koolance, etc fittings or the included fittings?
If you are using any of the other fittings you have to use a thicker o-ring. The o-ring is a USA standard #9. Some guys from overseas have had issues finding that exact o-ring. Vapor did post measurements, but I forget exactly where.
I did a quick google search and found these measurements. I'm not positive they are correct though: 5/8"OD x 7/16"ID x 3/32" wall
Some guys have taken the o-rings off the included fittings and stacked them on the o-rings from the other fittings and haven't had an issue that way.

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