Removing the sink will make the project easier. In our case we weren't able to loosen the split brass nut on the plastic faucet without lifting the sink. We also weren't able to remove the drain hose from the sink fitting which complicated the project a little bit. Lifting the sink is not difficult, only a bit messy in dealing with the butyl sealing tape. Once you remove the caps on the lid bumpers the screws for the 3 retaining clips will reveal themselves. They are not Allen but Torx head screws that match the lid. You don't have to totally remove them, only to loosen them a bit as they are quarter turn. The check valves are a push fit in the 1/2" male fitting, only held in by the friction of an
o-ring. A little prying will pop them out. Beware when tighting the hoses that the hose ends don't swivel, only the camper fitting does. From there small hands,
a new vocabulary and patience will get the job done. Another tip, open the hose storage door on the outside of the camper which will let in light through the thin plastic compartment to your workspace instead of using a flashlight. In hindsite I wondered if it would have been possible to remove the front of the cabinet instead of trying to work in the small cubby space. We are in Alameda if more information is needed. Good luck with your project, I'm sure you will enjoy the improvement.