This is what I used.

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Perko through hull bilge fitting. I used a flat rubber washer to seal it. Fitting-rubber washer-hull-rubber washer-locking nut. I used surgical tubing to connect the two fittings inside the hull. It is flexible and self sealing on the fitting barbs.

3.50 per fitting 20 cents per washer. Not a whole lot less than what the kit costs.

I also use the clear plastic tube around the the whole rope loop. Much easier on the hands and my fishing hooks / lure hooks don't get caught in bare rope. (nothing worse than having 3 of your beat lures hanging from the front of your boat when it comes tome to set up camp) :-[