occasionally a third party will be a non malicious but unthinking actor... after the first storm of the 04 hurricane season with 9 days without electricity, I added a new third bulk propane cylinder... which was purged, filled and kept in reserve... a year or so later, a fellow teacher and coach borrowed the cylinder for a team cookout... he asked one of the parents to get the cylinder refilled, and what I got back was a rusted "Blue Rhino" exchange cylinder.. it is now my "loaner"