The Pentair GW7504 is a Gear Kit for Pool Shark GW7500/GW7700. Now there’s an easier, more thorough way to clean your inground pool. Remove the PoolShark® pool cleaner from the box, attach the hose, place it in the water and watch it attack dirt as it prowls around the bottom and to the waterline of your pool. This is the “plug and play "cleaner you’ve been waiting for.