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Adapters and Accessories

Specialty chimney parts enable you to make easy connections between the Rock Flex chimney liners and other stainless steel chimney liner components. Our specialty parts provide a perfect fit for stainless steel flue liners during the chimney liner installation process.

Free Flow™ Chimney Liner Increaser/Reducer

Free Flow™ Chimney Liner Increaser/Reducer

316L stainless steel increaser/reducer for chimney lining connections. Now you can adapt pipes of many different sizes with this little handy guy. You can use this adapter to connect stainless steel rigid chimney liner to different appliances including inserts, fireplaces, wood stoves, etc. For flexible liner, you will also need an appliance connector to make a secure connection to the increase/reducer.

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Free Flow™ Chimney Liner Increaser/Reducer

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Standard Reducer/Increaser

Standard Reducer/Increaser

The sizes below are not available in Free Flow™ design, but are available as standard increase / reducers.

Standard Reducer/Increaser

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Chimney Flue Extender

Chimney Flue Extender

Need to offset 2 chimney liner caps adjacent from each other or extend your flue above the roof line? This little wonder provides an 18 inch offset / extension. Fits perfectly on to the top plate collar and accepts the Quick Connect Rain Caps at the top of the flue extender. A perfect fit every time for your stainless steel flue liner!

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Chimney Flue Extender

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Tee Extension Slip Connector

Tee Extension Slip Connector

This connector's male end slips inside the snout of our tee. It allows you to add 8 to 16 inches simply by sliding it in or pulling it out of the tee snout. A perfect fit, with no cutting required! The expanded end of the slip connector is female with an interior diameter 1/16" larger than the standard pipe it connects to. Perfect for when you need to add length to the horizontal snout of the tee.

Tee Extension Slip Connector

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Flex Liner Snout Adapter - for 5.5 in. to 8 in. liners

Flex Liner Snout Adapter - for 5.5 in. to 8 in. liners

The Snout Adapter reduces the tee snout diameter, allowing you to attach a flexible chimney liner without having to crimp the tee snout. For 5.5 in. to 8 in. liners only.
snout adapter with tee connector
Snout adapter shown with tee connector (not included).

Flex Liner Snout Adapter - for 5.5 in. to 8 in. liners

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Rectangle to Round Insert Adapter Boot

Rectangle to Round Insert Adapter Boot

Make connections between round flex liners to inserts and stoves with rectangle or oval exhaust openings. The collar is angled back toward the damper. Low profile clears most fireplace openings. Made of cast iron. Collar and base can be separated to adjust to 10 degree or 30 degree tilt. It is recommended that you use a chimney liner appliance connector to connect the liner to the insert boot.

Boot Dimensions
Outside Dimensions: 17.25" wide x 10.25" deep x 5.5" tall.
Inside Dimensions: 14.75" wide x 9.25" deep x 5" tall.
Wedge shaped.

Rectangle to Round Insert Adapter Boot

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Square to Round Connector for Flexible Chimney Liner

Square to Round Connector for Flexible Chimney Liner

Mates a dripless connection between square flex liner and the round opening or vertical pipe on your appliance.

Square to Round Connector for Flexible Chimney Liner

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Oval to Round Connector for Flexible Chimney Liner

Oval to Round Connector for Flexible Chimney Liner

Mates a dripless connection between oval flex liner and the round opening or vertical pipe on your appliance.

Oval to Round Connector for Flexible Chimney Liner   $124.99


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Rectangle to Round Connector for Flexible Chimney Liner

Rectangle to Round Connector for Flexible Chimney Liner

Mates a dripless connection between rectangle flex liner and the round opening or vertical pipe on your appliance.

Rectangle to Round Connector for Flexible Chimney Liner

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Custom Double Snouted Tee with Tee Cap

Custom Double Snouted Tee with Tee Cap

A tee with two take offs and a clean-out cap, it is designed to allow you to connect two appliances to one chimney liner. Select any two snout diameters from 3 inch through 8 inch. The standard snout length is 10 inches. The tee connector will extend 3 inches above the top snout and 3 inches below the bottom snout. Please enter your measurements in the form below.

Custom Removable Double Snouted Tee with Tee Cap - $239.99

Tee - Tee Diameter inches
A - Snout A Diameter (top)
B - Snout B Diameter (bottom)
D - Distance from bottom of A to top of B inches
Liner Type: Flexible Liner Rigid Liner

Snout Orientation:









Cast Aluminum Clean Out Access Door

Cast Aluminum Clean Out Access Door

Easy to install aluminum chimney cleanout/access door. These cleanout doors are perfect for indoor installation and durable enough to withstand the elements when used outdoors. They are manufactured right here in the USA. At last a rust free cast aluminum clean out door. This cleanout door is backed by a manufacturer's limited lifetime warranty. Comes in 2 sizes listed below.

Door size:8" x 8"
Masonry opening7.25 x 7.25
Access opening6.75 x 6.75
Outside dim.9.5 x 9.5
Door size:8" x 12"
Masonry opening7.75 x 11.75
Access opening7 x 11
Outside dim.9.875 x 13.75

Cast Aluminum Clean Out Access Door

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Insulated Cast Aluminum Clean Out Access Door

Insulated Cast Aluminum Clean Out Access Door

These insulated clean-out/access doors from Lyemance are available in three sizes. These clean-out doors are not recommended for smoke chambers.

Door size:8" x 8"
Masonry opening8.125 x 8.125
Access opening7.625 x 7.625
Outside dim.10.5 x 10.5 x 2
Door size:8" x 12"
Masonry opening7.875 x 12.375
Access opening7.5 x 12
Outside dim.10.875 x 15.375 x 2
Door size:12" x 12"
Masonry opening12.5 x 12..5
Access opening12.25 x 12.25
Outside dim.15.25 x 15.25 x 2

Insulated Cast Aluminum Clean Out Access Door

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Chimney Thimble Assembly

Chimney Thimble Assembly

Protect combustibles with a UL listed wall pass through thimble. Easy to install. Use in masonry or metal chimneys. Thru-the-Wall Insulating sleeves protect walls and adjacent combustibles on both sides. Prevents overheating of wood, drywall, wallpaper, etc. UL tested up to 2100°. Reduces the minimum 18" NFPA clearance spec. to 2". Use with single or double wall pipe.

The thimble is 8" long. You can add 8" by cementing two thimbles together with our Stove Gasket Cement. Or you can cut the thimble down with a hacksaw for thinner walls. See Installation Instructions.

Chimney Thimble Assembly

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Chimney Thimble Only

Chimney Thimble Only

Choose this option if you need just the insulated chimney thimble and do not need the metal sleeve and flange. Otherwise order the Chimney Thimble Assembly.

Chimney Thimble Only

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Safe-T Thimble

Safe-T Thimble

This thimble is UL listed and allows you to pass your single wall stovepipe through a combustible wall. It provides protection from the heat when the connector is passing through a combustible wall. The Saf-T Thimble features a solid-pack insulated snout that telescopes inward toward the wall allowing for easy adjustment were wall thickness is 4"-8.5". Both models need a 16" wide by 17" high opening for installations. Easy to install. See installation instructions.

Safe-T Thimble

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Off-Set Box

Off-Set Box

This two piece adapter / off-set box is designed to allow you to adjust the insert front and back from inside the firebox. The adaptor's top outlet receives the chimney liner. The bottom collar fits inside the outlet on the wood insert.

The 6" offset box measures 2 ½" tall x 8" wide x 14" long, has an offset adjustment range from 0 to 6", and fits 6" (I. D.) chimney liner.

The 8" offset box measures 3" tall x 10" wide x 18" long, with an offset adjustment range from 0 to 8", and fits 8" (I. D.) chimney liner.

Off-Set Box

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The Original Online Chimney Supply Co.