During new construction, it is often necessary to plan and prepare for conduit to pass through a concrete wall. Wall Sleeves are used during the forming process prior to the concrete being poured to ensure proper placement of the conduit and to allow for a more complete seal once the conduit is inserted. While the Link-Seal® Modular Seal works well without the wall sleeve, together they create a system that is superior to just the Modular Seal itself. Called the Century-Line® sleeve, they are made from HDPE and are 1/8 the weight of seeel sleeves. They range in diameter from 2" to 25" and have a built-in expansion joint.