plumbing layout.

How can I get the plumbing layout of the 3670?

What, this??
View attachment 8045
View attachment 8044

Not sure if this will help.......the attached is a schematic I made of the plumbing behind the UDC of my 2010 BC 3250ts.

RV fool, not trying to be a smarty pants(had to clean it up). Your best bet is to look under all the sinks, remove some of the underbelly, open up the basement walls, and just take a look. You should check all the "P" traps and all the water lines that come into the coach that you can find. Before or after every trip. They should be checked for tightness. One other thing, if you are camping with city water turned on....NEVER... leave it on if you leave for any length of time. You never no what can happen... like...open the door to let the water out. Remember, your coach is a rolling earthquake. Things do work loose.

The diagram was a big help I modified it to show the two three way valve and normal mode direction.

Glad it was of some help.......Godd additions!

Travel Safe!