I got this kit for my 2018 Ford Bought E350 Thor motorhome. It was a hassle to check and fill the rear tires (double). This kit gives you multiple options with different angles to choose from. To install, I removed the beauty salon caps. Installed the correct fittings for my setup, sprayed the fittings with soapy water to ensure a proper seal. Then I put the caps on. Now I don't have to remove the caps to check tire pressure.