Is there a water pump in there somewhere or does the sink and toilet have pumps on them?
The first TT my parents had used a pressurized tank, had to use air pressure from a service station or, if that ran out, a hand tire pump.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey