No one seems to be answering your question of how you get the air into the coach's pipes. The secret is the adaptor for the air. Mine is a plastic male hose fitting that has a short stem on top just like the tires do. It screws into the female hose fitting for water input to the coach ( I have a Jayco Precept Motorhome) My compressor has a lock on fitting which clips onto the stem of the little plastic fitting that screws into the female fitting on the water input to the coach. Which ever set up you have for city water is where the little fitting goes. That's how you get the air into the pipes of the coach. I hope that helps. I don't have a picture. The little air to female hose thread is very innexpensive. I have several of them in the RV tool box.