The "wedge" system is a design concept used during the installation of Shor-Line stainless steel run gates and panels to an existing or brand new room that has sloped floors and trough drain. The concept is simple yet effective. Our wedge fits perfectly to an interlocking channel found at the side panel's base. It also conforms to the kennel floor's slope. After caulking the wedge, a seal is created and prevents cross contamination. For assistance and additional information, get in touch with your Shor-Line sales representative. The recommended slope for kennel floors is at least 1/4" per foot. For instance, a run with a length of 6' would have a slope of 1 1/2" from the front to the back. Stainless steel drain covers are optional. The covers protect animals from the waste inside the drain trough. It also prevents toys as well as other pet stuff to go down the drain.