Janome single dual feed zipper foot ed cat d why would you need to use acu feed on a zipper well with many layers of fabric making up those seams sometimes just pinning in place will cause the zipper and fabric to shift while sewing especially when using more difficult fabrics like velvet or satin by using the acu feed flex zipper foot youll be able to glide easily over the seam without distorting your zipper for janome top loaders category d please note this item cannot be cancelled