The Cast In Place firestop sleeve is a one piece plastic body with firestop pre-assembled inside. This universal design can be used for both plastic and metallic pipes from 1-½” to 6”and will accommodate concrete thickness as thin as 2 ½”. Eliminate having to come back to install firestopping.
Sleeve + Firestop all in one step . . . Saves time and money.
Please see http://www.stifirestop.com for more details.