Separate pipes for black and gray tanks

PawPaw_n_Gram wrote:
The pictures I see on the web of models for sale show two dump valve pulls in the compartment on the road side near the dump connector. They also show a dump valve handle on the second tank dump connector. That indicates a black and gray tank in the front, and a gray tank in the back.

Verify that yourself - that there are three dump handles.

I found a copy of the 2014 brochure for the Voltage. The 3970 is listed with 160 gallons of fresh water, 48 gallons of black water and 96 gallons of gray water.

When you see specs that show twice as much gray water as black water - it indicates two gray water tanks and one black water tanks.

RV manufacturers vastly prefer to have the tanks the same size, so adding three tanks in different locations means they fit into an identical sized space under the floor between the frame rails.

I'm surprised at the fresh water capacity of the rig, but again the two tank likelyhood is high. 160 gallons of water is heavy - over 1,300 lbs. In one tank, a partial load could create surge issues while traveling.

(That rig has potentially 2,537 lbs of water with all tanks full. That is a LOT of water to haul around.)

But you need to verify those items by inspecting the rig. Look for possibly two fresh water pumps - that would confirm two fresh water tanks.

There are 2 handles in the compartment. One says Bath, one says Kitchen. So those make sense for 2 gray water tanks. Further back, right at the other outlet is another handle, which I assumed to be the black tank valve. I will have to verify.

I will look for the fresh water tanks. One thing I do like is the fresh water tank has a dump valve also. Our older rig didn't have that.