Unplug all of the water and sewer hookups to your RV and drive it to a designated waste water dump site to safely drain your water tank. Make sure your emergency brake is on and your RV is parked on a flat surface before beginning.
Remove the plastic toilet base cover with your screwdriver; the cover is held on with only one screw so it's easy to take off. Next, take out the two screws that hold the toilet handle in place.
Find the water valve and unscrew the two screws holding it in place and throw them away. The old screws may be corroded and won't work in the new valve.
Clean the little wire mesh screen filter on the incoming water supply side. The filter can get clogged and restrict water flow to the toilet.
Attach the new water valve with the new screws and then turn on the water to the toilet so you can make sure there are no leaks.
