Core Bore Firestop System

Price: from $90.00
Unique Core Bore Seal
Unique Core Bore Seal bottom view

Unique Core Bore Seal top view


The UNIQUE Core Bore Firestop System is a revolutionary way to firestop, cover, and smoke seal abandoned (empty) core holes in fire-rated concrete slabs and walls.  You may walk on it after installation!

Now in sizes for 1.5 – 2.0 – 2.5 – 3.0 – 3.5 – 4.0 – 4.5 – 5.0 – 5.5  inch diameter core bore holes.

UL Classified. Made in the USA.  


New Design! New manufacturing details have been added to our Core Bore Firestop System so it is now removable when your cabling needs change.

New Sizes! Now available in 1.5″, 2.0″, 2.5″, 3.0″, 3.5″, 4.0″, 4.5″, 5.0″, and 5.5″ to better fit your core hole’s diameter. These system sizes are based on the core holes diameter. For questions about choosing the correct size, installation or anything else, call our friendly expert Customer Service Support at 251-960-5018.

Use UNIQUE Core Bore Firestop System to cover and firestop empty core holes in concrete slabs or walls during construction and post-construction. These core holes are often abandoned when firestop sleeves or conduits in a concrete firewall or fire-rated barrier are removed.  Empty holes can be dangerous and are a fire hazard.

Our Core Bore Firestop System saves installation time and money while meeting all building codes. It is made of high-grade plate steel and a firestop muffin (plug). It comes with everything needed to install it except the firestop caulk. The heavy-duty Core Bore Seal is inserted into the hole and the prongs grab the inside of the core hole to fasten the system in place.  A bead of caulk under the top plate will smoke seal the Core Bore to the slab or wall. Our Core Bore Firestop System provides 100% firestop and smoke protection.

The entire system can easily be removed and is completely reusable if the core hole needs to be reactivated.

Order Unique Firestop Caulk here. It’s the perfect general-purpose firestopping sealant for all your firestop installation needs.

UL Classified with either Hilti or STI intumescent plugs.


Access the SDS for the fire-rated plug (muffin) here:

Certificate of Compliance

Access the Certificate of Compliance for this product:

Certificate of Conformance

Access the Certificate of Conformance for this product:

Product Data Sheet

Access the Product Data Sheet for the Intumescent Plug: