Replace Worn Out Flapper Scuppers - the Flow Max ball scupper features multiple mounting openings to make retrofits quick and easy - no filling holes or re-drilling Improved Drainage - self bailing scupper drain features a larger exit hole that offers up to 70% more drainage than other boat scuppers Keep Your Cockpit and Deck Dry - boat scupper ball uses neutral buoyancy to ensure a tight seal and eliminate the possibility of water flowing back into the drainage lines Easy Cleaning - self-draining scupper features a new twist-off design that makes cleaning out excess debris a snap Installation - scupper seal is slotted to fit over 1-1/8" motorwell tubes and includes a safety screw to keep valve in place - installation will require tapered head screws, Weight: 0.23 pounds, Manufacturer: TH Marine