Doggie Doo Drain Dog Waste Sewer Line Attachment Locate your sewer/septic clean out Screw in Doggie Doo Drain to sewer/septic clean-out and remove Doggie Doo Drain plug Place waste in Doggie Doo Drain cylinder and rinse down with hose, replace Doggie Doo Drain plug Locate your sewer/septic clean out Screw in Doggie Doo Drain to sewer/septic clean-out and remove Doggie Doo Drain plug Place waste in Doggie Doo Drain cylinder and rinse down with hose, replace Doggie Doo Drain plug Accepts 3 and 4 inch sizes Sewer/ Septic Clean-out