AVCM Retired wrote:
GON2SKI,
Sounds like we have the same problem not only with the valve but leaking.. Every time I go to dump and take the cap off, I have about 1 gallon of gray water dump out on the ground.. Very embarrassing. I am told that its is just a poor design. There is some kind of "P" trap in the line that captures some water. Then when you drive around it splashes down towards the cap.. Im not buying it..
I had a similar issue with our 29-5E, we finally worked out it wasn't a leaking valve, but rather the long line from the kitchen sink didn't drain quickly (recall we have exactly the same layout as a 27-5L, just longer).
My solution was to put a fourth valve right at the dump. This also allows me to open the two gray tanks and let the kitchen grey flow to the bath grew (since we don't shower in the rig, when boon-docking for a week).
Now my solution may not be possible with the new centralized system. But it worked with the old manual system.