The city water connection is easy to replace, but you may only need the garden hose washer. I would try replacing the washer first with a good quality rubber washer from the hardware store. There are many cheap plastic washers, get a good one. Also, be sure you are using a pressure regulator on the city water. Available at most RV parts dealers and possibly the same hardware store. If you are replacing the city water inlet, remove yours first to match it up. Just remove the screws & carefully pry the unit free of the sealant. If it's stuck, use a scraper to break the seal to the siding. Just pull it out far enough to use 2 crescent wrenches to unthread the inlet from the piping. Be sure to use pipe thread sealant on replacement.