How to represent a regulator chamber in sewergems?

In general, if I have something like this below. What would be the best way to represent this chamber in sewer gems?

Is there some type of regulator chamber icon I use? 

Or do I use pipes and split them and put controls on them for the weirs? Any advice would be great thanks

Right now I have it with pipes and putting control structures/flap gates on the conduits but getting high continuity errors. Therefore, was wondering if I do not have it set up the best way or if something totally not related to that.

 

Thanks!!