Simply Safe 1/2" Thermostatic Valve and Parts
The shower valve consists of the solid brass Valve Body, Thermostatic Cartridge, two Volume Control Cartridges, and two Check Valves. The parts within the valve have a lifespan of 15 to 20 years. Over time, wear and tear, plus the accumulation of limescale from precipitated hard water minerals in the water, cause parts to break, leak, or fail. To ensure continued safe and enjoyable use of your shower system, the manufacturer recommends servicing it about every 15+ years by replacing the Thermostatic Cartridge, two Volume Control Cartridges, and two Check Valves.
Replacing Simply Safe Thermostatic Valve Cartridge
Highly recommended tool: 17mm socket with long handle.