Groco 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. The FV-61075-A has a "T" shaped flow patternn and 360 degree handle actuation. Made in USA.