Brand: Redhead Valves
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The Air Fuel Control Valve from Red Head Valves is designed to positively prevent fuel overflow out the vent line during quick refueling stops. It also does double-duty as a rollover valve, closing off the vent line to prevent spillage if the valve is turned upside-down.
The large size (3.5" OD) allows a refueling rate of 2.5 gallons per second without affecting the flow rate. The valve closes so quickly that refueling at a rate of 2 gallons per second will only let 8 ounces of fuel (or less) to escape before flow stops. The unique clear windows let you watch the valve in action to ensure proper operation and a complete fill.
The 3.5" OD x 6.4" Long valve is designed for use with 1.75" ID hose (not included). Locate the valve upright higher than the fuel cell with the vent hose from the cell into the bottom of the valve. Then run the rest of the vent hose from the top of the valve to the rear of the car.
Note: The materials used for the body, windows, and float are designed to be resistant to petroleum gasoline. If you are running any other type of fuel or additives, you will need to test for compatibility with your chosen blend.