This is a great way to circulate air and keep mold from growing in your boat covers. This vent features a more open airflow design and wider top so it is less likely to allow moisture inside. Use this with the telescoping boat pole tubing you see in the picture on the right.
This is very easy to use, just cut a hole in the fabric and screw the vent on. This saves you time from the old models where you have to sew the vent to the fabric.