I was desperate because my HOA hired a bunch of water thieven' landscapers that have no respect for private property and what it meant to stop using private water from private homeowners. So I found this water bibb and gave it a try. It's the great investment! I had absolutely no terrible fitting it on my faucet with the house on it. I also have a 1.5" water pressure release attached to the faucet where the house attaches and it made the faucet cover fit even snugger! To lock it, i used a SMALL lock so you can't flip it to it's side and open it even more. Overall the best buy!
Con:
1. I wish the plastic was a better quality. It feels a little light and brittle. It could be smashed with a hammer I'm sure. But it would take a little doing to get to the faucet.

Apparently designed only for a hose bibb that is attached to a wall or house. Mine is a free standing "pipe" used to water plants in a garden. This "lock" will slip right off my bibb. The hinge has quite a bit of play in it, so you can wiggle the whole thing off the bibb-- maybe if it had a "backing" of some sort, it would not be able to be maneuvered to the angle needed to remove it. Regardless, the "play" in the hinge-- it opens a bit as the hasp of the lock that you would use has some width to allow the parts to move along it, so it does not form a tight lock on the 2 halves of the cover. This permits a screwdriver or lever of sorts to enter the cover and possibly rotate the valve handle. This product could actually be worse than nothing at all, as no thief will spend the time to re-insert a lever or screwdriver to turn the water back off!! The cover needs some way in which to "close fully" and maintain that closure.

I have a spigot on the front side of my house that I never use. Somebody, however, was turning it on and leaving it on for sometimes several days until I would finally notice. This was happening during our drought and it frustrated me to no end. This lock did the trick and there's a significant drop in price for my water bill.

Works great to keep my meth-head neighbors from sharing my house water without permission (It has been an issue...). I ordered these Bib Locks with small Master locks that do not allow the unit to be opened wide enough to access the water spigot handle. The unit is very easy to install, and can easily be removed for watering.

I really liked this option for Bib Valve Locks the most, because it allows me to leave the hose on the spigot. I would recommend them to anybody who needs to keep moochers away from their water supply.

It is ok, and it may serve the purpose of keeping people from using an outside water spigot, but the hinge leaves something to be desired. I can imagine that some people will think the thing is stuck and try to force it open, only to break or warp the hinge. You have to move it around a bit to find the position that will allow it to open. I may have received a problem unit, but it really just looks like it is built that way. Also, as others have mentioned, the length of a standard pad lock allows for this thing to be opened quite a lot. If you buy it you may want to get a lock with a short shank (U), or maybe an adjustable lock that can close down more and keep the unit from being opened while the lock is still locked.

Anyway I hope it keeps my neighbor from using my water all of the time. I have told him again and again to ask if he needs it, but he just hooks up my hose and drags it over to his house without asking. It is aggravating to be in the shower and all of the sudden water pressure drops really low and stays low.