From the product description, check product page for current description, price and availability:

Keep potential “beer-samplers” and kids out of your draft system with this Beer Faucet Lock.

Give yourself some peace-of-mind, knowing that your draft system is locked and your beer is safe. If you’re a serious homebrewer this thought has crossed your mind: the thought of someone walking by and pulling on the tap handle, letting beer run out. Be it friends or your kids, you want your system to be secure. This quick and easy Beer Faucet Lock attaches directly to the faucet. It gives a solid squeeze on the handle, locking it into place, without fear of damaging it. This one-of-a-kind lock is something you’ll be glad you own.

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