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The part that carries a flue through a wall

The best wall thimbles for 2026

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Wall thimbles sold on Amazon.com

The wall thimbles we cover that have a checked Amazon.com listing.

#ModelScorePriceBuy
1DuraVent 3PVL-WTS Pellet Vent Wall Thimble, 3 inBest for: A pellet stove vent through a wall.—≈ $80Check price on Amazon: DuraVent 3PVL-WTS Pellet Vent Wall Thimble, 3 in
2DuraVent DuraTech 70736 Wall Thimble, 7 inBest for: A 7 inch DuraTech chimney through a wall.—≈ $265Check price on Amazon: DuraVent DuraTech 70736 Wall Thimble, 7 in
3DuraVent DuraPlus Wall Thimble, 8 inBest for: An 8 inch DuraPlus system.—≈ $179Check price on Amazon: DuraVent DuraPlus Wall Thimble, 8 in
4DuraVent DuraTech 9643 Wall Thimble, 8 inBest for: An 8 inch DuraTech system.—≈ $171Check price on Amazon: DuraVent DuraTech 9643 Wall Thimble, 8 in
5Imperial 4100673 Galvanized Flue ThimbleBest for: A buyer who confirms the size and the code first.—≈ $16Check price on Amazon: Imperial 4100673 Galvanized Flue Thimble

Prices are indicative and were read on Amazon.com; the button shows the current one. If we earn a commission, it does not change the order.

A wall thimble carries a listed chimney through a combustible wall. It only works as part of its own system, so a DuraTech thimble is for DuraTech pipe. The thimbles here cover pellet vent and Class A chimney in 3, 6, 7 and 8 inches, and the telescoping ones state the wall thickness they fit.

These parts, set out figure by figure

  1. A silver galvanized chimney opening cover with an expanding funnel and insulation

    FIREFIX Chimney Opening Cover, to Ø 160 mm (6.30 in)

    Not a sleeve but a blanking cap — an expanding funnel with insulation, for a chimney opening that is no longer used.

    Diameter
    Fits openings up to Ø 160 mm (6.30 in) · A screw turns to widen or narrow the holders
    Depth
    Not stated; the listing’s table gives the cover as 6.7 × 6.7 in (17 × 17 cm)
    Material
    Galvanized steel sheet
    Insulation
    Included, stated to protect wallpaper from heat discoloration
    Pipe acceptance
    The maker does not state it.
    Retention
    Covers an unused chimney connection opening · An expanding funnel, stated to keep the cover firmly seated while remaining removable · Stated removable at any time
    Temperature
    Not published
    Certification
    The maker does not state it.
    Amazon reference
    B01N48J7MZ (one reference across 5 Amazon marketplaces)
    EAN
    4017537450754
    • Adjustable across a range rather than made to one opening size
    • The insulation is explained — it protects the wallpaper from heat marks
    • It closes an opening; it does not connect an appliance to one

    Best for: An old chimney breast with a second opening nobody uses, where a bare hole is drafty and ugly

    Check price on Amazon
  2. DuraVent DuraTech 70736 Wall Thimble, 7 in

    DuraVent DuraTech 70736 Wall Thimble, 7 in

    A telescoping 7 inch DuraTech thimble for Class A pipe, that fits walls from 5-1/2 to 9-1/2 inches.

    Diameter
    7 in
    System
    DuraTech Class A
    Wall thickness
    5-1/2 to 9-1/2 in, 16 in with field extension
    Weight
    6.7 lb
    Amazon reference
    B007W85S6Y
    EAN
    0662492634004
    • Telescopes to the wall
    • Fits between 16 in studs
    • Finishing collar not included

    Best for: A 7 inch DuraTech chimney through a wall.

    ≈ $265
    Check price on Amazon
  3. DuraVent DuraPlus Wall Thimble, 8 in

    DuraVent DuraPlus Wall Thimble, 8 in

    A wall thimble for 8 inch DuraPlus triple-wall chimney, for walls from 4-1/4 to 7-1/4 inches thick.

    Diameter
    8 in
    System
    DuraPlus
    Wall thickness
    4-1/4 to 7-1/4 in, 16 in with extension
    Weight
    7.5 lb
    Amazon reference
    B003JV1S6M
    EAN
    0662492008942
    • Adjustable
    • All-fuel use
    • 8 in only

    Best for: An 8 inch DuraPlus system.

    ≈ $179
    Check price on Amazon
  4. DuraVent DuraTech 9643 Wall Thimble, 8 in

    DuraVent DuraTech 9643 Wall Thimble, 8 in

    An 8 inch DuraTech wall thimble, on a three-line listing with 5 ratings at 2.5 out of 5.

    Diameter
    8 in
    System
    DuraTech Class A
    Finish
    Galvanized
    Weight
    6.9 lb
    Amazon reference
    B001M5MWZI
    EAN
    0662492620908
    • Right part for 8 in DuraTech
    • Known brand
    • 2.5 out of 5

    Best for: An 8 inch DuraTech system.

    ≈ $171
    Check price on Amazon
  5. DuraVent 3PVL-WTS Pellet Vent Wall Thimble, 3 in

    DuraVent 3PVL-WTS Pellet Vent Wall Thimble, 3 in

    A 3 inch wall thimble for DuraVent’s PelletVent system, with no text on the listing beyond the table.

    Diameter
    3 in
    System
    PelletVent
    Plate
    9 x 9 in
    Weight
    1.9 lb
    Amazon reference
    B0FPLTY7GR
    EAN
    0662492947883
    • Right part for a 3 in pellet vent
    • Known brand
    • No listing bullets

    Best for: A pellet stove vent through a wall.

    ≈ $80
    Check price on Amazon
  6. Imperial 4100673 Galvanized Flue Thimble

    Imperial 4100673 Galvanized Flue Thimble

    A cheap galvanized thimble, on a listing that says 6 inches in the title and 7 inches in the bullets.

    Diameter
    6 in in the title, 7 in in the bullets
    Material
    Galvanized steel
    Weight
    4.5 lb
    Amazon reference
    B00PV46TDC
    EAN
    0063467145103
    • Very low price
    • Simple part
    • Size conflict on the page

    Best for: A buyer who confirms the size and the code first.

    ≈ $16
    Check price on Amazon

For which need, in wall thimbles

A pellet vent through a wall

A 3 inch part for PelletVent.

DuraVent 3PVL-WTS Pellet Vent Wall Thimble, 3 in

A 7 inch Class A chimney

Telescopes to walls from 5-1/2 to 9-1/2 inches.

DuraVent DuraTech 70736 Wall Thimble, 7 in

An 8 inch DuraPlus chimney

For walls from 4-1/4 to 7-1/4 inches.

DuraVent DuraPlus Wall Thimble, 8 in

For whom, within wall thimbles

A stove on an outside wall
A wall exit can be simpler than a roof penetration.
A thick old wall
Check the telescoping range, or plan an extension.

What each advantage costs, on wall thimbles

Named system against generic
A generic thimble costs little and may not satisfy your inspector.
Wall exit against roof exit
A wall exit needs more elbows and costs draft.

Before buying wall thimbles

What is a wall thimble?

A listed part that carries a chimney through a wall with the required clearance.

Can I use any thimble?

No. Use the one made for your chimney system.

Do I need a permit?

Often. Check with your building department.

What to remember about wall thimbles

Start from your chimney brand and let it choose the thimble.

A quick look at wall thimbles

  • Highest figure for weight: DuraVent DuraPlus Wall Thimble, 8 in (7.5 lb).

Wall thimbles in one table

The column appears only if four appliances in five state the value. A half-empty column separates nobody.

ModelPriceDiameterWeight
Imperial 4100673 Galvanized Flue Thimble$166 in in the title, 7 in in the bullets4.5 lb
DuraVent 3PVL-WTS Pellet Vent Wall Thimble, 3 in$803 in1.9 lb
DuraVent DuraTech 9643 Wall Thimble, 8 in$1718 in6.9 lb
DuraVent DuraPlus Wall Thimble, 8 in$1798 in7.5 lb
DuraVent DuraTech 70736 Wall Thimble, 7 in$2657 in6.7 lb
FIREFIX Chimney Opening Cover, to Ø 160 mm (6.30 in)—Fits openings up to Ø 160 mm (6.30 in) · A screw turns to widen or narrow the holders—

Also worth reading on wall thimbles

Where the output figures come from

Specifications: manufacturer sheets for wood heating equipment and the matching Amazon product pages. Prices and availability: read on Amazon.com from a New York address. Every figure in this table names its source.

Most recent revision in this category: November 14, 2026.

How we assess wall thimbles

The price beside each product is fetched as this page opens, and it is the only figure here that is current. Any amount written into the prose was read once, on the day that sentence was written, and nothing has refreshed it since.