Six-port fuel valves are used where 2 tanks supply a single engine, and a return to each supply tank is required.

ABYC H33.9.2 states that fuel system valves must have an independent means of support. That's why regular in-line valves are not appropriate for fuel systems applications.

FV-65038 and FV-61075 provide flow to or ofrom either of two connected tanks with its "L" shaped flow pattern and 180-degree handle actuation. FV-65038-A and FV-61075-A provides flow to or from either connected tank or both tanks simultaneously with its "T" shaped flow pattern and 360-degree handle actuation.