TBN01001U Toto MiniUnit Universal Rough-In Box We don't match the concealed system to each trim; instead we use a shared module. You can choose the functionality you need such as a thermostatic type or push button type. Universal rough-in to allow easy customization of valves and trims without removing walls Corrosion resistant solid brass valve body 360 degree box design to minimize installation error 1" tolerance adjustable to thinner or thicker walls Compact body measured at 4.4" diameter and weighted 1.6 LBS for and effortless installation Requires volume control valve or positive shut off valve