Fusion by Danze MAT-3TH-DKB St. Charles 3/4-Inch Thermostatic Shower Control, Dark Bronze 3/4-Inch thermostatic valve and trim Solid brass construction Ceramic disc valve provides smooth turning action and prevents drips Requires the use of 3/4-Inch wall volume control for complete shower system Flow rate is 17.5-Gallon per minute at 50 PSI