PVC cap and metal bar!!!
This is just a PVC cap with a short piece of pipe painted red and a metal bar with one bend and a hole drilled in it.  All of the five star reviews are within 5 days of each other almost a year ago.  These might keep young kids from turning off your gas, but they wouldn't slow down a 12 year old with one arm and a baseball sized rock.
Rating: 1 stars