Grohe 1/2-inch thermostatic cartridge (thermo-element) designed for repairing and maintaining compatible Grohe shower and bath mixer valves. It is made of durable brass and is known for restoring precise water temperature control. 
Key Details and Specifications
Function: This is a replacement thermostatic cartridge responsible for mixing hot and cold water to maintain a consistent, safe water temperature, preventing scalding.
Construction: The cartridge is made of brass and includes a wax element and a non-rising spindle.
Dimensions: It has a total height of approximately 81.6 mm (3.2 inches) and a maximum diameter of around 31.8 mm (1.25 inches).
Installation: It features a screw-in connection type and is relatively easy to install for those with basic plumbing skills. 
Compatibility
The Grohe 47217000 is compatible with a range of Grohe shower valves and systems, including: 
Grohe Amera shower system
Grohe Aquatower 2000
Grohe Chiara thermostatic bath/shower mixer
Grohe Eurodisc SE self-closing shower thermostats
Grohe Rainshower system for wall mounting
Grohe Tenso thermostatic bath/shower mixer
Grohe Concealed body for THM (thermostat shower mixer 1/2")