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Turns out that shower head diverter valve also can be opened/closed by pulling it out or pushing it in. Unbelievable. I must have had it pushed all the way in (closed position). We have been in this house for 3 years and never knew that we could turn that valve on/off.

John - I will definitely give this a shot. Thanks!

Thanks for the reply, John. I did try installing the cartridge upside right and upside down, same results. I just don’t see how flow makes it up to the shower outlet in any situation!

...also - I wound up not replacing the 4 port valve with the one that was included with the new shower head assembly (new one pictured below), because I am not very comfortable with making the proper connections. I think the hot and cold water inlet connections are PEX, with the outlet to the...

Hi all - this all started so simple yesterday. We were having low hot water flow to our shower head(s). I went to Home Depot to pickup a new 1222 cartridge, and ultimately came back with a new magnetic detachable shower head assembly (which included a 1222 cartridge). Anyway, I removed the...