Product review (4 stars): Great features but doesn't fit all tubing.
This is the best I've found, BUT as my problems have been with Chinese  beverage centers with precious little freon and no way to recharge, I need a tap that fits Chinese tubing. The spacers provided don't fit but are close enough to lead you astray.

After the first one died from a leaking tap, the replacement beverage center exhibited the same freon issues after a year or two and I looked for other line tap solutions. After buying several and trying them, I returned to this one as having superior features. I improvised the spacer, winding mylar tape around the bottom of the clamp until the right clamping diameter could be achieved. Still working, but what a pain.