The Century-Line engineered sleeves are available from PSI Thunderline/Link-Seal.

The Century-Line engineered sleeves from PSI Thunderline/Link-Seal are used to create circular holes in all types of concrete poured barriers, including walls, floors and ceilings. Molded from non-conductive, high impact resistant HPDE, the sleeves are lighweight and are available in 16 diameters from 2" to 25".