The Eight.3 Telescoping Floor Ballast Bag gives you an additional 400 pounds of weight in the mid portion of your boat. Maintaining proper weight distribution is essential for building a wake that is bigger, but still has the correct shape. That's why Ronix developed their line of Eight.3 Floor bags, which are designed to be filled right on the floor of v-drive boats for the ultimate wake. This combo includes the compatible Eight.3 3700GPH Telescope Pump. Take the bag + pump out of the box, onto your boat, and you are ready to build a bigger wake.