Dripper Guard prevents water discharge from boat thru-hulls to run down the side of the boat hull eliminating stains. Made of soft rubber allows, Dripper Guard to flex and bend as needed in case of rubbing against the dock. Installs in minutes, simply prep, peal and stick using high strength 3M VHB tape. UV protected provides long lasting protection and durability. Spend less time and money cleaning and enjoy more time on the water with Dripper Guard! Dripper Guard sizing: The thru-hull size is measured by the outside diameter SMALL - Fits thru-hull sizes up to 1 7/8" outside diameter LARGE - Fits thru-hull sizes 1 7/8" to 2 5/8" outside diameter