This custom 50" x 24" x 24" rear locker ballast bag is the same size as the standard Fly High W719 and W719-EXV but includes a fifth drain port on the back panel. This ensures compatibility with all of our factory integration kits as well as the Malibu and MasterCraft plug and play systems while still allowing the use of the WakeMAKERS X-Link ballast transfer system.