Zodiac Pool W81700 Wahoo Above-Ground Diaphragm - The Zodiac Wahoo has only one operational moving part–the diaphragm. No gears, wheels or flappers means simple operation which ensures peak performance, maximum power and low-cost maintenance. Automatically removes dirt, debris, bugs, twigs, leaves, sand and even pebbles. Flowkeeper Valve—compact self-adjusting flow control valve automatically regulates water flow, ensuring peak performance even with lower horsepower pumps.