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GP876851 Rite-Temp Mixer and Pressure-Balancing Unit Kit,Compatible with Kohler Part GP76851,Include Replacement for GP800820 and GP77759

From the manufacturer

Replacement Rite-Temp pressure-balancing unit cartridge and cap kit, includes GP800820 and GP77759
Replaces Kohler part GP76851
Compatible with Kohler shower valves K-304 and K-11748 platforms
Latest Rite-Temp technology maintains even temperature, preventing water pressure fluctuations and protecting the user

Resistant to aggressive water conditions providing long-lasting performance

For Kohler Part GP876851 Rite-Temp Mixer and Pressure-Balancing Unit Kit, Black

The Rite-Temp pressure-balancing unit cartridge is designed to seamlessly retrofit existing shower valves for easy installation. It is built to withstand a greater range of water conditions and will provide long-lasting performance.