SpeediChannel Wall Penetration, 4"SpeediChannel, 4" Wall Penetration, Used To Transition From the SpeediChannel System To a Through Wall Penetration, Paintable, Color: Natural, Includes: Stainless Steel Screws. 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. DiversiTechs wall covers are designed to allow for easy