Using an RO 125 with a non Festool vacuum

Received the 452879 hose today.  It has the correct 27mm tool fitting and the other fits my Pullman-Holt S25 perfectly.  Gosh that 27mm is sure tight going on, I stopped trying after two ribs thinking I might break the fitting off the RO 125.  Is this normal for a new one and it loosens up over time?

Videos I've watch, guys just pop it on and pop it off!
 
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