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I called American Standard again with a little more information. It ends up that the shower valve is a R020 "Non Pressure balance" and the tub is a R120. The extension kit DOES NOT work on the R020, per American Standard, and DOES work on the R120. I guess the only thing left to do is cut out...

I did call American Standard and you are correct.....they are clueless. He had no tips or tricks to solve the problem and just wanted to send me a new cartridge (even though I told him that I already purchased a brand new cartridge and it still leaks).

The three screws hold the metal ring to the plastic manifold. The ring is about an 1/8" thick and holds the cartridge. The stackup is the same on both valves... o-rings, extension, rubber washers, cartridge. Also, I put some valve lube on the extension to evaluate contact at the interface to...

Thanks for the response Pete. I have placed a close-up picture of the extension and cartridge at the link below. The interface between extension and cartridge is where the leak is with the torque on the screws at max. I also swapped extensions between the bathtub and shower and the shower...

I placed the deep rough-in kits on both my shower and bathtub and the shower one will not stop dripping. The valves are American Standard single handle "R120?". The bathtub has a different manifold than the shower, see pictures, and I don't know if that is the reason the shower drips and the...