Used on Tonneau covers, these also stop the poles being knocked over and reduce moisture, mold etc. Can also be used where the tonneau eyelet has been ripped out.

Boat Vent 3 is a boat cover vent that is easily installed to help air circulation. UV resistant material. Fast installation. No screws or awls needed. 40% more venting than Boat Vent 2. Fits 3/4" or 7/8" tubing. Attach to the top of adjustable mooring pole (BV2P). Use for venting the area below the cover.