Easywalker Height Adapter Set for Harvey 3 With the height adapter set for the Harvey 3, your baby in the stroller attachment and seat unit is even closer to you. Especially for big parents makes it easier to lift in and out into the cozy tub or the buggy seat unit. Individually, the height adapter set can be removed later. Then perhaps your little explorer would like to sit alone in the seating unit. Product: * compatible with Harvey 3 stroller attachment and seat unit * increased position * easy fastening