Hansgrohe Vivenis 1x Single-Lever Bathtub Mixer with Backflow Preventer and Aerator: Prevents the entry of non-potable water into the drinking water line during negative pressure (safety combination). Quick filling of the tub: with up to 25 l/min. Maximum flow rate for the shower head is 24.3 l/min (both at 3 bar). Temperature limitation protects against water that is too hot. High-quality single-lever mixer for controlling 2 functions: tub inlet and shower head. Advantage of concealed installation: More space at the edge of the tub. Basic set for installation required (to be ordered separately). One handle is enough: Switching from tub inlet to shower head is easy with the smooth diverter, equipped with Hansgrohe's high-quality, easy-to-use ceramic mixing system. Built-in sound absorber reduces the water flow noise – for extra quiet operation. Delivery includes: Single-lever bathtub mixer, function block, mounting materials, installation instructions.