Concealed In-Wall Toilet Carrier System 2 in. x 4 in. for Wall-Hung 1.28 GPF Dual Flush Toilet Tank Only in BlackA great choice for bathrooms with limited space. With the carrier concealed in the wall, only the bowl and actuator plate are mounted to the wall, resulting the sleekest design that is incredibly easy to clean. When choosing a wall hung toilet, you will need to select a carrier matching your construction studs, either 2 in. x 4 in. or 2 in. x6 in. Installed on 2 in. x 4 in. studs behind the wall for thinner residential walls Dual flush with high