The house designs on the K2 and K4 have the patio attachment, the K2 features a T150 Patio cleaner which is a little more simple when compared with the K4 which has the T350 T-Racer Surface Cleaner which has handles on it allowing for for vertical cleaning making it perfect https://zandersfnvc.rimmablog.com/22456055/makita-bo5030-vs-bo5031-vs-bo5041-vs-dewalt-dwe6423k-can-be-fun-for-anyone