Increase the number of outlets from a single air pump.
Independently control the air flow from multiple outlets.
Attach the airline from the air pump to the inlet on the left hand side of the gang valve. Attach the airline from each accessory to the outlets above each tap on the gang valve.
Secure the airline to the top of the gang valve by placing them in the tube clips. Adjust the flow of air to each accessory by turning the tap on the outlet the accessory is attached to.