specification Product Name: French Mouth Extension Rod Material: aluminum alloy Length: 60 mm Color: black Purpose: Ordiry FV method inner tube valve is too short, use this extended valve when pumping is inconvenient to facilitate pumping How to use: Screw this extension nozzle on the nozzle in the interval of the cutter ring to play an extension function. When the mouth exceeds the cutter ring, it can be inflated normally. You don't need to remove it at ordiry times, just screw it on. Widely compatible with most bicycles, suitable for common French inner tubes Precautions: The extension rod of the mouthpiece is only used for pumping up air. There will be air leakage when pumping up. Please use a high-pressure pump to pump up. It can still be fully pumped. If conditions permit, add a little anti-falling glue on the mouthpiece, and the effect will be better.