4 in Dia Smaller End x 5 in Dia Larger End 18 in PVC Extension Pipe

This is the most recommended upgrade you can add to your order, this pipe allow you to conceal the pump behind the wall. If you can configure your new bathroom to hide the pump then absolutly do it. The 18 in extension pipe was designed with the idea to reduce time when installing the Saniflo macerators. It has an inner gasket which connects to the rear spigot of the Saniflo toilet without any difficulty. Its sealed connection keeps water from seeping out once the toilet is flushed. The PVC end of the pipe can be cut down in length as needed.