CAL Aqua Labs 13mm Efflux F2 Outflow
The Efflux F2 has a 13 mm tube diameter for 1/2" tubing and carries a downward-angled funnel. The width between the arch is approximately 4.3 cm. It is designed for aquariums 20 gallons and larger that use 1/2" tubing for the canister filter outflow. Each F2 Efflux pipe is supplied with two suction cups.