Creates a void on the top surface of a concrete slab for plumbing access. Fastens directly to a 2-inch (50.8 mm) 3M™ Fire Barrier Cast-In Device for Metallic Pipes. Remove 3-inch (76.2 mm) foam insert after slab is cured to create 3 in. (76.2 mm) deep void.
- Firestop tested for up to 3 hours, when used in conjunction with a 2-inch (50.8 mm) 3M™ Fire Barrier Cast-In Device for metallic and non-metallic penetrations, in accordance with ASTM E 814 (UL 1479)
- Easily adjusted height accommodates concr
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