It seems that every pressure vaccum breaker in our neighborhood leaks excessively. By excessively, I mean that the ground is always muddy in the area below the PVB. All these systems were installed by the same contractor within the last two years. I checked the canopy on mine and it appeared considerably loose. I hand tightened it and it seemed to stop the leaking. Was this the right or wrong thing to do? I am not familiar with how these are suppose to be set. Thanks for any help!