[overlander64]

Greetings Jim F!

What you are suggesting "backing grey water into blackwater tank" is something for which instructions exist in the owner's manual (at least for mid 1960s coaches). It does, as Jack suggests, greatly shorten the time between trips to the dump station. It is also another reason to always be sure to have a tight fitting rubber plug in the bathtub drain. The basic process suggested in the owner's manual is:

1.) Place a blank (no hose connector) termination cap on the dump valve.

2.) Open blackwater tank gate valave. (You now have the setting to back-up the gray water into the blackwater tank).

The time when it gets a bit unpleasant is when dumping:

1.) Before dumping, close the blackwater tank gate valve.

2.) Place bucket under the termination cap (Be sure to wear gloves) and remove termination valve - - be prepared because there will be sewage trapped between the termination cap and the gate valve.

3.) Attach your usual sewer hose and continue with the normal blackwater tank dump routine.

This process only works if the blackwater tank is mounted below the floor which elimates the possibility for trailer that like my Minuet have the blackwater tank mounted above the floor - - it does work with my Overlander where the tank is mounted below the floor.

Kevin