Diversitech 230-WC4 4" Wall Penetration Cover is used to transition from the Speedichannel lineset covering system to a through wall penetration. The wall sleeve (Sold Separately) 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 include stainless steel screws to attach the wall cover to the base. Three screws (Not Included) are needed to fasten the wall cover to whatever type of wall construction the system is being installed on.