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I did check the pressure. I have 76psi and it drops to 71psi when I start the shower.

I also checked the water flow and it is deliverying 2.5gals in 70 seconds with no shower head attached. ...

Thanks. I have replaced the head, but it appears to be the size of the cartridge. What I have been hoping for, is to get an older version cartridge that allows more water flow.

I believe that...

I just moved into a new house and the pressure is 78 lbs/sq-in, which is good. But the shower flow is awful. My plumber indicated that it is due the new 2.5 gal/min cartridge law.

Is there...