The Hayward AXV604WHP Wing Kit fits Hayward Pool Vac Ultra, Navigator and Pool Vac Plus pool cleaners. The wings are a common wear item on Hayward cleaners and replacing them will help you get the most efficient cleaning path and suction out of your Hayward cleaner. The wing wear indicator is a horizontal line which has three vertical lines above it. When you can no longer see the horizontal line, the wings must be changed.