Thank you very much George

I am in a lake where there are no gray water extraction services at the dock and it is a problem.
For this reason, I want to install a second point of direct discharge to the outside, with a valve so as not to eliminate the gray water tank.
The links you send me are very useful to have an idea of ​​how to do it. If you can send me a photo of the solution in the J30, I would greatly appreciate it.