Originally Posted by CraigCA
Can you share details on how you're plumbing the gray water tank and where and how you're mounting it? I want to do add one on my '71.
I thought the best would be to have the gray flow to the black to help flush it and then exit the same opening at the back.
Craig, it is good to open the black tank first then flush the hose clean with the gray water. However I do not think it would be a good idea to connect the two tanks. If gray can flow into black. The reverse can happen.
You want a way to drain each separately with no danger of cross contamination from black to gray.
Sometimes when we are off grid booney camping on our own property, we would like to drain just the gray. It is just a little (Bio-degradable) soapy water. That gives us a little more room for an extra shower before heading out.
My black is beneath the sub-floor directly under the toilet in the rear of our 64. Some trailer have a black tank above the floor.
I added a gray tank just behind the axle. The drains from the sinks, tub and vent all connect above the floor, the vent goes up though the roof and drain pipe drops though the floor into the gray tank. It would be hard to drain a tub/shower into a gray tank unless it was under the floor.
If you are under there plumbing anyway it's not hard to put in a Valterra dual valve. I think I used a Valterra T-81, their a lots to chose from.