Wall sleeves and penetration covers are used to transition from the SpeediChannel? system to a through wall penetration. The wall sleeve creates a neat hole through the wall, and the line set is covered by the wall cover. DiversiTech's wall covers are designed to allow for easy installation - even after the line set has been installed. A unique hooking and fastening arrangement allows for quick and easy installation. Each wall cover is individually packed, and is furnished complete with stainless steel screws to attach the wall cover to the base. Three screws (supplied by others) are needed to fasten the wall cover to whatever type of wall construction the system is being installed on.