Are you talking about using the water pump or city water hookup? If the water pump near the water pump there should be a fitting with a clear top and metal screen inside. You can unscrew the clear top and clean anything caught inside.
Enjoying life at our Colorado cabin
2011 Roadtrek C210P
RZR 570, Ranger 1000
Previously: 1999 36' Foretravel, 1998 Newell, 1993 Newell