Our shower developed a steady drip from the faucet. I opened up the shower control, removed the K-304-KS Rite-Temp™ Pressure-balancing Valve with Screwdriver Stops. Bought a new one (a mere $96!) and replaced it - as far as I can tell, according to instructions. Now, when I turn the water back on, it's not possible to stop the flow of water completely - there's a high pitched whine from the hot water side, and now there's dripping from the pressure balancng unit itself. The folks at the plumbing supply place were no help whatsoever... any suggestions out there?
Instructions for the Kohler Rite-Temp valve here