


Superior Firestop Thimble for 8-Inch Chimney Joist Penetration
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Superior Firestop Thimble for 8-Inch Chimney Joist PenetrationThe Superior Firestop Thimble (38FST) is an essential safety component for 8 inch chimney systems when penetrating a floor or ceiling joist. Built with heavy duty steel, this thimble provides maximum durability and helps maintain proper clearances to combustible materials during installation. It is designed specifically for use with Superior 8DM series chimney pipes to ensure a perfect fit. Proudly made in the USA, it ensures your wood burning
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Your Superior Firestop Thimble for 8-Inch Chimney Joist Penetration orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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You'll receive a tracking link by email once your Superior Firestop Thimble for 8-Inch Chimney Joist Penetration ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.5 ★★★★★
Based on 287 reviews
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Product Reviews
★★★★★ 2
Quality control lacking
One tee conector was missing. Nothing avaliable locally that fits.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 13, 2025
★★★★★ 1
It doesn’t stay in
The pipe keeps coming out. Not worth the money. Not sturdy to hold a top table.
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Reviewed in the United States on February 20, 2024
★★★★★ 2
Good finish, poor hardware.
Set screws are poor quality and are sometimes powdercoated on the exposed threads. Leads to striped hex sockets and inability to tighten properly.
Durable finish as evidenced by no visible damage after throwing parts across the shop in frustration.
Ended up running self tapping screws thru parts to complete assembly.
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Reviewed in the United States on February 26, 2024
★★★★★ 1
Kinda flimsy…
Thought the assembly was metal, it’s some kind of PVC.
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Reviewed in the United States on September 22, 2025
★★★★★ 5
Stable and easy to assemble
I used these to support a heavy piece of countertop would to create a side table. Looks great and holds steady.
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Reviewed in the United States on February 15, 2023