Making repair possible - so replacement isn't your only option!
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?
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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."
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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.
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Restores Precise Control: Over time, mineral buildup can make temperature adjustment difficult. Replacing this unit restores smooth handle rotation and reliable temperature accuracy.
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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?
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Thermostatic Cartridge Assembly
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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.
| Feature | Details |
| Part Number | 1477 |
| Item Type | Thermostatic Cartridge |
| Length | 4" |
| Broach/Spline | 20-Point |
| Base Diameter (OD) | 34mm |
| Material | Solid Brass |
| Cross-Reference | Moen 130156, 90003971, 106842 |