If you have a new 22QB do not try and follow the instructions from FR that are titled 2015 Winterizing. The pictures in that document do not represent what Coachmen is actually building.
Here is the low point drains
Here buried behind the heater ducts are the Hot water tank by pass.
The water pump is not near the shower per instructions but behind a panel in the Basement
Close-up of the pump
Now I haven't worked out how to install the CAMCO By-Pass kit as Coachmen decided to mount the input line tight against the drain line.
The fitting they suggest we use is a special order part so if you decide to go that route plan ahead.
When / if i figure out how to install the by-pass kit. I will post the information here.
Good Luck
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RV Tire Safety. 48 years experience as tire design & forensic engineer. My RV Freelander 23QB on Chevy 4500 chassis. Giving seminars on RV Tire applications (not selling)@ FMCA Conventions. Mar 20-22 Tucson AZ