The worx replacement side discharge chute is for mower models: wg718, wg780, wg781, wg788, wg789. this 50015963 chute fits under the side chute flap to discharge the grass clippings out from under the mower or away from the bagging feature. no tools needed to attach it. simply lift the side flap and let the force of the flap hold the chute in place. use the chute to direct the grass clippings to the right side of the mower.