The 6401: Second Story Floor Sleeve Adapterprovides a way to have floor sleeves on every level of your facility. Normal installation of floor sleeves is achieved with unit bolts to underside concrete or a beam. Support and stability is possible because of the 6-⅝” O.D. heavy-gauge steel, 0.156 wall tubing and steel channels. This adapter measures at 6” I.D. and is for use with all sleeves. Compatible with all ADP volleyball systems.