Check the listing for details. Hayward PoolVac Ultra/PoolVac/PoolVac Classic/PoolVac XL/Navigator V-Flex/Naviga. Color: Blue, Condition: New. Listed at 15.95 USD. Hayward PoolVac Ultra/PoolVac/PoolVac Classic/PoolVac XL/Navigator V-Flex/Navigator Pro/Hayward Blu Flap Adjuster Flap Adjuster (AXV031B) is a replacement part that was made by Hayward from the same high-quality materials used to manufacture the original Factory part making this a genuine OEM product. The Flap Adjuster was created to allow you to adjust the angle of the flap to the surfaces of your specific pool and the angles it may have, either lower or higher depending on the pool. This part is Aqua Blue and is meant to attach to the Lower body where the rear Flap should be installed as well. From the Lower Bodies side is where you can make the adjustment to the level of the Flap with the help of a Flathead screwdriver, but in our opinion, we recommend keeping it at its Factory setting of 1 as this works best for most inground pools.