Very awkward to lock and unlock. The sliding flap only slides sideways, you need to point the small cymbal key to the slot. Otherwise my tank will become blocked and difficult to open without damaging it. Works like a one-way ratchet, it only tightens, but when loosened it spins freely until the key is inserted and turned. If you lose your key, don't worry if you want to damage the device by sticking a screw or something in it. This will block it and allow it to open. Apart from the standard tank cap thread, there is no mechanical connection to the vehicle. I don't think this is anything unusual or a problem. I'm only sharing what I didn't know when I bought this item, as the ad doesn't provide instructions and doesn't adequately describe it.
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