Kohler 876851 mixer pressure balancing unit bath faucet part

Replacement Pressure Balancing Unit

The Kohler 876851 mixer pressure balancing unit is a direct replacement component for compatible Kohler shower valves. It restores consistent temperature control by compensating for fluctuations in hot or cold water supply pressure. Homeowners and plumbers use it to fix temperature swings without replacing the entire valve body. The unfinished plastic construction is designed for installation inside the wall cavity.

Fits Inside Existing Valve Body

This unit threads into the existing Kohler valve housing, so no re-piping or tile removal is required when the valve body remains serviceable. It frees the installer from sourcing a complete new trim kit or rough-in valve. Compatibility is limited to the specific Kohler models that accept the 876851 part number; verify the original valve documentation before purchase.

Mechanical Operation Without Power

The balancing mechanism operates purely on water pressure differentials, requiring no electricity, batteries or electronic sensors. Normal use adds negligible flow restriction and produces no audible noise beyond standard water flow. Because it contains no heating elements or motors, it draws zero power and introduces no thermal load to the plumbing system.