You really should use 3M 4200 or 5200 for sealing the through hulls to the boat. Also if you look inside of the through hulls you should see a couple of ridges 180° apart from each other, if you find the right width wrench, you can jam it into the through hulls and hold it against those ridges while someone inside the boat tightens the nuts.

I use silicone spray to lubricate the inside of the hose as well heat on the hose. Don’t heat the pump barb.


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