Grey tank to black tank crossover
Our 2 black tanks hold twice the size of our 1 grey for some unknown reason. 78>38. Yes those are the numbers. Has anyone made some type of connection so the grey starts to get full, the flow will fi...
Forum Discussion
Old-Biscuit wrote:
DO all three tanks drain thru a 'common header' to one outlet?
If YES........
THen simple mod
Add an extra valve in horizontal run of drain header.
With it closed......
You can open grey tank and black tank drain valves and let them equalize
All three valves open.......114 gal WASTE capacity (14 gals more then fresh water tank capacity or 4 gals more then fresh water capacity ---fresh water tank and water heater)
I have done this mod on several of my trailers ....waste is waste
If not wanting to do the permanent valve install (3" drain valve and 2 flanges) there is a 'twist on' drain valve that installs right on end of drain line. Remove end cap, twist valve on.
I prefer the permanent....it isn't hanging on end of drain pipe adding extra weight, have to remove/stow for travel otherwise it is bouncing and could crack drain line or 'teets' that hold it in place.
About $25 for twist on
About $15 for glue in place
We have 2 drain ports for sewer. 1 in front of the axle that uses the same port as the front grey tank. Another black/ grey behind the axle for our rear axle. This tank is about 20 gallons (im guessing) I have no intent on linking to the rear unless it's accessible and feesable to do so. Im thinking of drilling a hole and welding a port and use a hose with a slight downward angle to allow flow into the closest black tank.
