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Yes, that is the unit in question (Moen part no. 3330). I discussed with the person on at HD the relevant problem of non-removable cartridges. He told me that Moen has told him in the past that tapping the outside perimeter of the valve lightly with a hammer will loosen the factory seal and...

Thanks Rugged, Is this tool available at Home Depot or should I seek a specialty plumbing supplier? Also, if the cartridge is "stuck" does that also mean that it is broken or defective. I guess the question is, do I need to replace the cartridges prior to reinserting them into the valve...

Hi - I have what appears to be a rather difficult time doing something apparently very simple. I am attempting to pull the two cartridges from a Moentrol valve in preparation of pipe soldering. The instruction pamphlet indicates that this is accomplished is two easy steps: 1. remove the two...