Based on numerous posts here on the topic over he years, some folks have a leaky vent, and others do not. I am one of the lucky ones. If you have a leaky vent, just remove it for the winter and put a solid bolt in its place. As said, the Mudd's wheels come with a bolt, which is a nice touch. Just be sure you store the vented plug where you can find it in the Spring. Some folks wire it or zip tie it to the gearbox for storage.