The Elite 2-way air control valve allows you to run up to 2 air driven products at once. Each valve has a flow adjuster which enables you to regulate air output to each devise. The valve is leak proof and suitable for fresh or saltwater aquariums. The Elite 2-Way Air Control Valve Features and Benefits: - Splits the airflow into multiple streams - Will not leak up to 5 p.s.i. - Molded design no seal rings screws rivets joints or seams - Hanger fits all standard aquariums - Suitable for fresh or saltwater.