Plumbing, A few new Questions

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comment about the Dursos.

I read as well that you should go up one size but my experience it's not required with the larger pipe size.

I'm running 2-2" threaded bulkhead with Dursos and they are both silent and I'm splitting probably 1000gph between them.

To make, just threaded a 2" TA into the bulkhead and built up from there staying with 2". The only mod I did was because of limited space in the overflow towers using 2", and since couldn't find a 2" street elbow, was to basically make one by cutting the 90 and Tee back before coupling.