GrohFlex™ A better universal valve system introducing GrohFlex a universal valve system designed to meet the needs of the North American market. It offers affordable flexibility in function and style. It’s easy to install, easy to upgrade, and easy to maintain. It’s designed to help make a complex business easy. Only the new GrohFlex system covers such a wide range of installation types from single-showers to tub/shower combos to high-flow custom showers with just one universal rough-in. Plus, GrohFlex offers pressure balancing and thermostatic control options for both the master and secondary bath. And its smart design features easy, intuitive operation with all functions controlled from a single axis, reducing the need for separate volume controls and diverters.