Husqvarna Viking Interchangeable Dual-Feed Foot (920219096) Box is a bit tatty due to storage but it has not been used. The Dual Feed Foot with changeable presser feet is designed to feed layers of fabric and/or batting evenly.
I’ve wanted a dual feed walking foot for some time, but have never tried one in dressmaking. It just glides across projects, giving neat topstitching. Beautiful results. I don’t know how I ever managed without a walking foot!