Abstract: A quick attaching mechanism is provided for a walk-behind mower power unit. The walk-behind mower power unit deck has upper brackets attached to the front of the deck and lower holes drilled into the lower part of the vertical sides of the deck. The accessory unit deck has an upper horizontal rod attached to the left and right sides of the accessory unit and lower attaching holes corresponding to the lower holes in the left and right lower sides of the power unit. The lower sides of the accessory unit also have a V-shaped adapting bracket to facilitate the alignment of the lower holes. Once the rod is pivotably secured in the upper brackets and the lower holes are aligned, a handle pin is inserted through the lower holes and secured. Utilizing this method and mechanism many different types of accessories are readily and quickly attached to a walk-behind power unit.