Berucci Replacement Diaphragm for Zodiac Baracuda G3 G4 &ndash; Part W69698 Replaces Zodiac Baracuda G3 G4 Alpha 2, Alpha 3, Alpha 3 Plus, Wahoo, Ranger 1500, Manta II, Genius, and Kontiki  Part W69698 Diaphragm needs to be replaced when it becomes soft and diaphragm is soft and the cleaner won't move Manufactured with the same high quality material as your OEM diaphragm It regulates the water flow and enables the cleaner to function properly. Berucci is a trademarks of A & S Global, Inc