Mocal inline vent valve, with 6mm push on tails for nitrile rubber type fuel hose. This model needs to be mounted vertically within the fuel tank breather pipe, with the unscrewable end placed to the bottom. Anodised red for corrosion protection and good looks, with an internal ball valve which allows the fuel tank to be vented, so that as fuel is used, the tank will not collapse due to a vacuum being created. These valves allow air to replace the fuel, but in the event of the car rolling over, the valve closes and prevents fuel from escaping from the fuel tank.
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