Atrio® thermostatic mixers ensure the temperature you select remains constant for the duration of your shower. No shocks, no surprises, just a constant stream of perfectly mixed water at the temperature of your choosing. GROHE Trim, 2-Function, Atrio® Collection, 3.2 to 6.3 gpm Shower Flow Rate, 2 Handles, Lever Handle, 6-11/16 in Dia x 4-7/16 to 5-5/8 in D Trim, Thermostatic Ceramic Cartridge, Hand Shower: No, 45 psi Pressure, Wall Mounting, For Use With: Shower and Tub, Brass, StarLight® Polished Chrome, Import