STI's 4 in. SpecSeal® Cast-In Firestop Device for Combustible and Non-Combustible Penetrants is designed for installation during concrete construction, providing a consistent firestop opening without requiring drilling after the slab is poured. Its bidirectional sleeve can be used for both floor and ceiling penetrations, while the integrated intumescent material expands when exposed to elevated temperatures to help seal penetrations against fire and smoke. The CD401GW is rated for concrete pours up to 8 in. and is suitable for applications involving plastic or metal piping, cables, and insulated pipes when used within an approved firestop system.