As Sloopie says, you want a thru-hull fitting from the boat store.
Also be aware that the outlet will become an inlet if you are taking water over the sides of the boat. Depending on where you mount it, that may or may not be a problem. You might consider adding a check valve to prevent inflow of water.
Hardshell Kayak Sail Rigs
Paddler's Truck Rack
First Need Purifier
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