Plumbing in reverse! :)

[JAAB]

Hi folks, I admit I do things in an odd way, like putting in my entire bathroom before determining where my Grey water lines are goin into my not yet existing tank.
So, I have a shower toilet combo, the toilet drain being about 26" away from my shower drain. This will work for me using two wedge tanks stacked, one for black and one for grey....but my question is....CAN I directly plumb my shower drain into the tank? it sits immediately over the tank, I have maybe 6 inches of room between bus floor and top of tank. Is there an appropriate one way valve that will fit? What should I be using as my shower drain and grey water plumbing line? Do I have to create a "P" trap for the shower?
Thanks!! I am having a great time doing this, just need some nudges in the correct way!

[somewhereinusa]

If you plumb directly it will stink. Search for hepvo, takes much less space than p trap.

[JAAB]

Argh. I was kinda thinking that. ty...

[JAAB]

That should work, I can run it out of the shower drain into the hepvo 45, then into the hepvo and with a turn or two should go right into tank!

[o1marc]

I was trying to find out what size plumbing was being used and found this video on the trap, sold me, couldn't be any easier.

https://www.youtube.com/watch?v=DGJWz6ozQ3o