Factory replacement locking gas cap comes with two keys. Have peace of mind with this extra-added security. Not only do you keep thieves from siphoning your gas but also vandals from dumping who knows what into your tank and causing costly repairs. A special feature of this locking gas cap is its ability to be used without the key. If you lose the keys you can still use it as a regular gas cap as the key is needed to lock the cap once it is twisted on. This prevents accidentally locking the cap without the key available.
Some factory gas caps have tethers which may or may not fit the new GM locking gas cap. GM changes their design quite frequently and this could change at any time. These do not come with tether.