GP876851 Mixer Cap & Pressure Balancing Cartridge Kit – Replacement For Kohler K-304 & K-11748 Shower Valves

About This Product

If your Kohler shower has been acting up—dribbling, temperature swings, or just not feeling right—this GP876851 kit is probably what you need.

It includes the mixer cap (GP77759) and the pressure balancing unit (GP800820) that work with Kohler's K-304 and K-11748 valve platforms.

The idea is simple: replace the old guts and get back to a steady, comfy shower without sudden cold blasts or scalding surprises.

The parts are made from durable plastic and brass, so they resist corrosion and wear.

One thing to pay attention to: before you install, clean the valve body with the included sandpaper, lube all the O-rings, and make sure they sit flat in the grooves.

And whatever you do, don't twist the cartridge when inserting it—just push it straight in, or the O-rings can shift and cause leaks.
Tighten the cap screws and you're done.
No special tools needed, just a little patience.
This kit saves you from buying a whole new valve and keeps your shower happy.