Do you have a "water center".
Fresh water supply.
Black tank flush
Valve to adjust water system use - ours has 4 positions:
City– Pressure feed fixtures from 3/4" hose connection on backflow preventer.
Normal – Pump from the on-board tank to the fixtures using on-board pump.
Tank – Pressure fill the tank from 3/4" hose connection at backflow preventer. 100 gallons in 7 minutes.
Sanitize/Winterize – Draw in sanitizers and winterizing fluids from a bucket utilizing the
on-board pump.
take a look at this posting - may help has a water system diagram in it
http://www.keystoneforums.com/forums...ad.php?t=29820