Durastall Extended Base Kit. Add this kit to the bottom of the standard base included in the Mustee model No. 80 or 140 Durastall Shower Stall (bought after 6/1/16) to raise the base up by 2-3/4 In. This will allow you to run a 1-1/2 In. PVC pipe (not included) from under the shower floor, on top of the sub-floor to an existing drain. Kit includes the 82.400A Drain Assembly for 1-1/2 In. PVC, solvent weld. The drain can be positioned so the pipe can run out from under the shower floor in one of four directions. This allows you to set up your Mustee Durastall Shower stall in places other than directly over the drain.