Advance Tabco Challenger 21 inch Series NSF Rear Filler -- 1 each.The Slimline and Challenger filler units are just the thing to complete the line up. These units come in both series so that they will line up neatly. We offer a large variety of angles from 30 degree through a full 90 degree corner with a leg assembly. These units are designed to be installed in the field by connecting them to the adjoining equipment creating a seamless underbar layout. These units come standard with 4" high backsplash, pre-drilled holes on the sides for easy installation. The full corner units come with a single leg set for extra sturdiness.