scubatoys:If the bubbles are coming out from under the boot... 9 out of 10 it's the little o-ring on the swivel spool, and not the hose. But when you take it out of the boot and stick it in the bathtub with some pressure, you'll know.
If it's just the o-ring - here's an article on how to fix it: http://scubatoys.com/store/joelarry/hpspool.asp
Are the spools all "standard" size? If not, are they the same for suunto and uwatec?
thanks!