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, so in-line valves are not suitable for fuel system applications. Features L" Flow Pattern Mount feet included C84400 bronze construction Specifications Size: 1/2" Main - 3/8" Return Weight: 3.05 lbs