Review on Quality Assured Twidec Position Toggle Switch: KCD1 5 103 by Justin Pavelko

Firstly, this switch is NOT waterproof. So if you actually install it on a boat, make sure you don't splash water on it. Water gets in and you have a very expensive repair. I used the shower head to try it out and sure enough water got in. If you ever need a switch for a boat or other watercraft, stay away from those switches and look for ones that are truly waterproof. I'm not sure why the seller would recommend them for a boat unless the boat never sees water or rain.