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Here's what I've got. The Check Valves are removed and pictured. They obviously needed cleaning, which I've done. I now have pressure back but still have temperature fluctuation. Do these need to be replaced? I still can't get the center section removed. I can't get it to unscrew. Any...

It's a temperature control with seperate volume controls. With my limited knowledge I would suspect the crud issue. Water is slightly hard. So, is the cartridge in the center of the valve? Are any special tools required for removal. I wasn't able to remove anything past the exterior knob...

Thanks for the reply, Jim. I'm on municipal water and nothing else has changed. All pressure is the same in other faucets. I assumed it was a thermostatic valve but now I'm not sure. How can I tell the difference? I've looked at www.groheamerica.com with no luck. I don't find an exact...

Hi All, I have a Grohe shower faucet and valve that suddenly has fluctuating temperature and pressure. It's been working fine since installation in 1997. From what I've read, it sounds like a cartridge or other cleanable or replaceable part. My problem is I don't have any documentation or...