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Whats the best way to transition from cast iron soil pipe to pvc? 4 in to 3 in. Previously there was just a 4 in x 3 in flexible rubber coupling with 2 worm gear clamps on it, connected to a 3 inch L piece of 3 in PVC pipe(you still call this nipple? guess it could be eliminated with a street...

I'm asking about this product specifically https://www.ipscorp.com/pdf/studor/STU021_TrapVent_web.pdf Does anyone have experience with it? When I first started looking at air admittance valves, I wanted to be sure to get ones that would never(hopefully) fail. So just wanted to know what you...

Running a new line from meter, will be using PE pipe/tubing, ~85ft run, will either be using either 1 1/4" or 1 1/2"...should I use pipe or tubing? Being able to used barbed fittings and worm gear clamps is attractive, but from what I've read CTS is the more conventional choice in this...

With a T fitting on the cold inlet, and the hot inlet capped off. or The same supply line running to both inlet ports. And setting the "mix temp" on the TS valve to what you want the diverter temp to be? A simple TS valve is MUCH cheaper than a diverter valve for some reason...why wouldn't...

In general, per BTU, do NG condensing tankless water heaters operate more efficiently at higher or lower temperatures? Would it be better to run it less often at a higher temp or more often at a lower temp? Basically wondering for radiant floor heating, in an open system, would it be better to...