I use automotive type clamps on vinyl hose myself. I have run into tight fits and you can try two ways. A drop of kitchen soap might help. If that fails you can warm the vinyl up with a hair dryer (matches, lighters and propane torches just melt it, I know). Last resort, buy an end to end fitting and some different hose plus new clamps and size it up a bit or replace the whole vinyl with a piece.
Note, vinyl has a short life at full pliability then gets harder, replacement may be a good idea anyway.
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