I'm not sure if the issue has been resolved, but the factory O-rings that seals the hose connector to the canister are too big. It was fine going on the first time, but trying to get it off took tremendous effort. The worst part is, after a few times of disconnecting and reconnecting, the o-ring would get stretched and won't sit properly any longer, resulting in leakage.
So, if this is the case, you'll want to buy these
http://www.ebay.com/itm/BLUE-FDA-VITON-O-RINGS-119-QTY-10-15-16-ID-X-1-1-8-OD-/190557424187?hash=item2c5e1b8a3bYou
So, if this is the case, you'll want to buy these
http://www.ebay.com/itm/BLUE-FDA-VITON-O-RINGS-119-QTY-10-15-16-ID-X-1-1-8-OD-/190557424187?hash=item2c5e1b8a3bYou