HIGH-QUALITY MATERIALS: Made from high-quality materials, the cartridge is built to withstand the rigors of daily use, ensuring longevity and reliability APPLICABLE CARTRIDGE: Only for thermostatic Valve A4910 A4913BO A4917 and A4717 remove with 17mm or 11/16" open jaw wrench THERMOSTATIC CONTROL: It regulates water temperature automatically to keep it within a preset range, enhancing safety by preventing sudden temperature spikes or drops PRECISION ENGINEERING: The thermostatic cartridge operates with precision, allowing for fine adjustments to temperature settings, thereby enhancing user comfort and satisfaction EASY INSTALLATION: This thermostatic cartridge is easy to install and replace, and professional maintenance personnel and DIY enthusiasts can easily install and replace it Cartridge Replacement Compatible with Rohl C7912 Cartridge for Thermostatic Cartridge, Brass