Thermostatic Cartridge

What is this? This is a high-precision thermostatic cartridge designed for single-handle shower and tub valves. It is the primary internal component responsible for mixing hot and cold water to reach and maintain a specific, safe temperature.

What does it do?

• Maintains Stable Temperature: The cartridge automatically adjusts the water mix to compensate for pressure changes in the plumbing lines (such as when a toilet is flushed), keeping the output temperature within a safe range to prevent "shower shock."

• Scald Protection: It features an internal safety mechanism that can shut down the water flow if the cold water supply fails, protecting the user from accidental burns.

• Restores Precise Control: Over time, mineral buildup can make temperature adjustment difficult. Replacing this unit restores smooth handle rotation and reliable temperature accuracy.

• Heavy-Duty Construction: Built with a solid brass body, it is engineered to withstand high water temperatures and resist corrosion for a longer service life than plastic alternatives.

Will it fit my needs? This model is a common replacement for various luxury and imported brands. It features a 20-point spline (the "teeth" where the handle attaches) and has a total length of 4 inches. It is a direct alternative for several specific valve models, including those used by Moen, California Faucets, THG, and Watermark.

What comes in the box?

• Thermostatic Cartridge Assembly

• Pre-installed O-rings and Sealing Gaskets

Thermostatic Cartridge The Thermostatic Cartridge is a professional-grade repair part designed to restore accurate temperature mixing and anti-scald protection to high-end shower systems.