WaterPik Repair

I have a WaterPik WP-20W.
The hose that carries water has developed a crack near the end
held by the user.
I have tried to repair the leak with electrcial tape, but that did
not work.
I cannot figure out a way to get heat shrink tubing over the break.
I will appreciate any sugegstiosn for repair.
The WaterPik Web site has not been helpful.

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