Recent content by John Gayewski

I've not tried this alot but I actually think they would go together. I worked with a guy from Europe and they use straight threads with rope in the threads. I think tape would seal these two. I haven't had occasion to experiment although I do have a claw foot tub.

Ips will refer to many types of things, like if you go to the store you'll see a section of straps/hangers for ips and a section of straps/hangers for Cts (copper tube size) Npt or NPS just refers to straight or tapered versions of the same threads.

Iron pipe size. Nptt vs npts National pipe thread taper, national pipe thread straight

https://www.amazon.com/gp/aw/d/B08JCLHLDK/ref=sspa_mw_detail_0?ie=UTF8&psc=1&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9kZXRhaWwp13NParams# Might work, but I think there are actually better ones.

Ips and npt are the same thing. You might just mean straight threads on ips. There are adapters for this, but tape and dope should do it. For a safer bet look for ips straight x taper adapters.

Yep

Looks like this is going to drip water in between uses, probably from the bottom one constantly. I think those shower head outlets should be coming from the bottom of those rungs. Also the supply should come into each side in the middle. The path from each inlet to each outlet should be equal.

Is your system a primary secondary secondary system? With one loop delivering hot water to the other (secondary) loops?

Ferguson?

Pipe that spans from floor to ceiling should be supported from above and at the floor. Using a pvc tee would be my choice with a riser clamp at the floor. Wye into the stack. Long sweep 90 or combo with cleanout horizontally.

Thermal switch as in thermostat?

I guess the wording in the section on wet venting would come into play here. Is there a portion of the wording that says "undiminished in size"? As in a wet vent shall be minimum 2" and blah blah blah... shall terminate undiminished in size blah blah blah... @wwhitney would be the expert on...

A diagram of the piping layout might help.

Coming this late in the game I would use an AAV. But the plumber should have been in mix from the start.