Specified Technologies Closet Flange Firestop Gasket (10 pack)


Base Price: $

1 – 9$156.97
10 +$146.97

Additional per foot:
1 – 9$156.97
10 +$146.97


The Specialized Technologies closet flange firestop gaskets available at Discount Low Voltage are one-piece, molded rubber, intumescent pads that install beneath 3” or 4” closet flanges to effectively firestop openings. These STI firestop gaskets permit proper firestopping of drain pipes connected to a toilet flange without caulking. 

Installations are foolproof. These gaskets provide a perfectly seamless fit, with no tools required. UL classified and code compliant, each die-cut rubber gasket is perforated to highlight removable inserts designed to accommodate different outer diameters of toilet flanges.


These gaskets may be used with plastic or metal pipes. Common applications include iron flanges and pipes as well as PVC and ABS toilet flanges and drain pipes. 

In stock, they usually ship within a business day of receiving your order. 


Buy in bulk and save with these STI firestop gaskets. We offer quantity discounts on these products, so the more you buy, the more you save. 

These gaskets will also save labor. They install from the top, so installation requires no ladders or lifts. 

They also save materials costs and hassles, because you don’t need to purchase or clean up messy caulk to install them. In addition, orders we ship outside California pay no sales tax, and qualifying orders are eligible for free shipping. 


Watch the video on the product page to learn more about the advantages of these quality gaskets. Downloadable user guides and data sheets are also available. 

For answers to any questions, call or email us. We’ll give you all the technical information and advice you need to do a top job.