EZwhelp Box Corner SeatDon't be left on the outside! Our EZwhelp Box Corner Seats allow caregivers to sit inside the box for easy and close proximity to the puppies. Our corner seats work for both the EZclassic and Fab System Models. To install: EZclassic Boxes remove red inserts from underside of seat. Place on top corner of whelping box until snug on panels and posts. Fab Boxes with red inserts in place on underside of seat, place on top corner of whelping box with liner