I had those valves from Skidim. My thought was to make winterizing a snap
My experience was that they clog very easily with silt and scale. The passages around the valves are very narrow. I wound up removing them every winter which sort of defeated the purpose.
If you do use them, make sure to poke a wire up in them to break up any potential blockages.
Im sure it depends on the lake conditions where you use your boat but after trying them, I'm not a fan.
Last edited by Jorski; 12-16-2012 at 05:00 PM.