Kohler Pressure Balancing Unit Cartridge with O-ring, 2PCS Replacement Model GP500520 Fit Compatible with Kohler Shower Valve, Rite-Temp Bath and Shower 1/2" Single Handle Valves

After installing, the valve leaked. Turns out it had nothing to do with the replacement cartridge. After much on line searching, I found the valve housing was corroded where the main o-ring seals. There was scaling and green corrosion on the brass housing causing a rough surface and a leak at the o-ring seal. I used a light acid solution to remove most of the corrosion and scale then I used 800, 1000, 3000, 5000, 7000 and 10,000 grit wet paper to polish the surface. Added a little silicon grease to the o-ring and valve surface, reassembled and the leak was gone. The unit functions perfectly. I would not be surprised if some of the "leaking" problems reported by others were not due to this issue.Also, I disassembled the failed pressure cartridge out of curiosity and found the internal pressure diaphragm was completely rotted away causing random mixing and unstable/unpredictable temperatures. This failure also caused the nearby bathroom sink to have hot water coming from the cold faucet! That was a very bizarre and confusing symptom.Hope this helps someone.

It is not well finish and the water still drips, not as bad as before. I cleaned all the surfaces but it still leaks.

Easy to install without having to pay for a plumber at a high cost. My hot water was not working but now it is working fine after installing the PBU myself.

It's a very useful item.

With a little knowledge of plumbing anyone can replace this cartridge. Shipping was fast and the price was right. However, the gaskets that were included did not fit the unit. I had to use the o rings from the old unit on the new one. So far, there are no leaks.