Motion Pro Fuel Line Quick Disconnect Couplings - Single - 1/4in. 12-0029 Single shut-off valves When connected fuel will flow and when disconnected fuel will not flow For fuel supply (fuel tank to carburetor), use the original quick=disconnect couplings with the single shut-off valve Available for 1/4in. and 5/16in. i.d. fuel line Capable of withstanding temperatures of -40 degrees F to 180 degrees F / Made in the USA