If you've thought about adding a flapper to your boat's scuppers but don't want to drill holes in the boat's transom, take a close look at the EZ Scupper ($19.99) from Seaworthy Innovations. This product utilizes 3M VHB tape to adhere to the hull, and like scupper flappers that screw in place, it helps keep water out of the cockpit when reversing. The tape creates a watertight seal that resists petrochemicals as well as salt water. The rubber flapper is held in with a deep retaining groove that allows for replacement when the rubber wears out, as it always does. Featuring a stainless-steel finishing ring, the EZ Scupper is designed for use on transom scuppers only.