A coupling component has upper and lower surfaces. A nipple extends downwardly for securement to a clean out line. A passageway extends centrally through the coupling component and nipple. A lid is movable between a closed orientation positioning the lid upon the upper surface of the coupling component and an open orientation positioning the lid at an angle with respect to the upper surface of the coupling component. A pedal operatively couples the lid with respect to the coupling component. A spring has a first end operatively coupled with respect to the pedal and a second end operatively coupled with respect to the coupling component. When a user steps on the pedal, the lid will rotate upwardly to the open orientation. When a user removes a foot from the pedal, the spring will rotate the lid to the closed orientation.