The Holdrite® HYDROFLAME™ PRO Series Water Dam attaches to the top of the Pro Series cast-in-place firestop sleeves and adds a 2 in tall water dam barrier at the perimeter of the sleeve opening. Sizes are available to fit all Pro Series Sleeves, for all sizes of penetrants 1/2 in thru 6 in nominal size. See Riser Clamp load rating chart below. Thread sealant may be added to male threads prior to installation, if desired. UL-Listed accessory when used with HoldRite's HYDROFLAME™ PRO Series Sleeves.