Aquarium air valves and fittings come in different styles. A straight fitting connects two tubes; elbows allow tubing to go around corners without kinking; an aquarium "T" valve splits a single line into two; a cross fitting splits one line into three. Keep in mind that you need a powerful air pump to split the airline. An aquarium air check valve like the offering from Hagen prevents water from coming out through the tubing. An aquarium air control valve, or gate valve, lets you adjust the air flow.
Valves and Fittings