Star Water Systems 023260 Extension Pipe Kit Powerflush Optima Plastic BRAND NEW! THE BOX WAS OPENED AND INSPECTED. This extension pipe is used to put the Powerflush Optima pumping station and discharge pipes behind a wall. The extension pipe is four inches in diameter by 18 inches in length. It attaches to the rear discharge outlet of the PowerFlush Optima toilet bowl and pump station with flexible couplings and stainless steel worm clamps (included). Must be installed with a downward slope away from the rear discharge outlet of the toilet bowl. Extension allows for hiding of Pump Station behind wall. Extension Kit for S1201(Ace No. 4697132) and S1203 Sub Brand Powerflush Optima Product Type Extension Pipe Kit Material Plastic For behind wall installation of pump and pipes Comes with connection fittings and clamps White in color to blend in with toilet Hides pump and pipes behind wall Behind wall installation must have access to pump