Picture of the Road Shower 2 elbow with the Road Shower 4 hose attached. This hose will fit the RS03 and the RS04L. It will not fit RS02, RS04 or RS04S. However, you might want it for the extra length and remove it before traveling.
Please note that this hose will not fit directly on the Road Shower 1. A 1/2″ hose bib must be installed such as pictured above, or an adapter must be installed on the existing elbow. See adapter here.