Return stop valve) for fuel or windscreen washer fluid Connection 6 mm. This valve is a real

improvement for classic vehicles that use a hand pump without a ball valve to deliver water. This ensures that windscreen washer fluid is always available at the spray nozzles. Please note the direction of flow during installation! It also prevents petrol from flowing back in the fuel line (useful for longer periods of inactivity). Please install this valve close to the petrol pump (between the petrol pump and the tank).