Its a 2006, Yamaha of course, 4 stroke I am putting it away for the winter and thought I would check the plugs so I can plan on replacing next spring IF needed. Pulled off the plug wires and looked inside the hole and there is a C shaped what appears to be rubber around the base of the plug. I tried to remove with a awl type hook and it was on pretty good, I decided at that time just to leave things alone. So does it come off or do you need to push in really hard on your spark plug socket to remove? BTW this is my first time owning this pontoon, and its possible these are OEM plugs!