Seal an opening or add an outlet to the end of the Dura Slope® Channel Drain to connect to 4 in. sewer & drain pipe with the Dura Slope End Cap/Outlet. Reference guide marks make it easy to cut to desired channel drain depth. To install as an end outlet, knock out end to create the outlet, cut off male side tabs, and secure to male end of the channel and secure with screws at indication points. Keep knockout intact to use as an end cap. Made of high-density polyethylene (HDPE) containing UV inhibitors