Use Cleanout for Bar Drain (No backwater protection?)

[Nate5452]

Hello,

I am looking to put a wet bar in the one area of my home. There is currently a cleanout port there (see Picture). I know that I should and will keep clean out access there even if I tap into it to drain for my wet bar, but was wondering if I should be concerned about backwater protection? There are other backwater valves located upstream.

I am pretty sure they don't make a backwater valve that can be mounted vertically, but I could be wrong.

Are there any options to keep some type of backwater protection?
I few things I looked at:
1. Installing a 1 1/4 check valve prior to the cleanout.
2. installing a 3 inch backwater valve under my bar counter, but before the sink drain (i.e. Floor Cleanout -> 90 degree elbow -> Backwater valve -> A few more bends, PVC, and a reducing coupling -> sink drain)
3. A plain old ball valve (yup, if left open--there might be a problem).

Is any of this possible, am I missing something, or do you think I don't need backwater protection??

Thanks
Nate

 

[Nate5452]

This is sort of what I was thinking of as my best solution, but I doubt it was ever done before. Its a little non-standard, but it should give me backwater protection (after the sewage reaches the other Backwater valve first and has a chance to fill up the PVC underground--at which point it will continue to fill up into this (since it's located above ground))