Funny thing I came across the other day in the pet store while I was in line to check out I noticed a can labeled "train your dog with this product" or something to that effect. I picked it up and started to read the can and the idea of the product was when your dog does something you would like to discourage pull the trigger on this can and it will send out a horrible sound that the dog will not like. Kind of like a dog whistle in a can. As I kept reading I noticed the propellant was R134a. Makes me think about all the money spent on tools, equipment, and recycling not to mention government agencies to make sure to minimize the release of this harmful gas and here is a product that basically is just venting the same gas that I have to take great care not to vent. Nice job EPA.