For a stove with an oval flue collar that needs to connect to round pipe, choose an oval-to-round adapter that matches both the collar dimensions and pipe diameter. The 6-inch LLPParts and Imperial options are the closest matches for a 6-inch round system; the 7-inch LLPParts adapter is intended for a larger round pipe. The other products below address related stove-pipe connections or diameter changes, not a rectangular-to-round shape conversion. Measure before ordering and confirm the fitting is appropriate for your appliance and venting system.
| Product | Best suited for | Connection detail |
|---|---|---|
| LLPParts 6-inch Oval-To-Round Adapter | Oval collar to 6-inch round pipe | Oval side listed as 7-1/2 by 3-1/2 inches |
| Imperial 6-inch Oval Round Adapter | Buyers seeking a 6-inch oval-to-round fitting | Product details do not specify dimensions |
| LLPParts 7-inch Oval-To-Round Adapter | Oval collar to a 7-inch pipe system | Product listing identifies it as 7-inch |
| AllFuel HST 6-inch Stove Collar Adapter | Connecting single-wall pipe to an appliance | Crimped end attaches to appliance |
| Moxweyeni 6-to-5-inch Reducer | Changing round pipe diameter | 6-inch duct to 5-inch duct |
LLPParts 6-Inch Oval-To-Round Adapter
This is the most specifically documented option for converting an oval stove flue collar to 6-inch round pipe. The listing identifies a 24-gauge black adapter with an oval side measuring 7-1/2 by 3-1/2 inches. Its overall height is 9-1/4 inches, and the round side is listed as 6-1/8 inches to accept crimped 6-inch pipe.
Best for: Buyers whose stove has an oval collar close to the listed dimensions and whose venting system uses 6-inch round pipe. The oval end is described as crimped to fit inside the stove’s oval section.
- Choose this if the stated oval dimensions and 6-inch pipe connection match your measurements.
- The listing describes a one-year product warranty.
Limitation: It is listed for an oval collar, not a rectangular one. Verify the collar shape and measurements rather than assuming a rectangle will fit because its area seems similar.
Imperial 6-Inch Oval Round Adapter
The Imperial product is identified as a 6-inch oval round adapter in black. Its name makes it relevant to buyers connecting an oval stove outlet to a round flue, but the supplied product information does not give the oval-end dimensions, overall height, gauge, or detailed connection orientation.
Best for: Buyers who have confirmed that their appliance needs a 6-inch oval-to-round adapter and can verify the product’s exact fit details before purchase. It provides a straightforward 6-inch category match for comparison with the dimensioned LLPParts option.
- Better for shoppers who can confirm fit from the product listing or manufacturer information.
- Compare the oval opening and insertion direction with the stove collar and pipe ends.
Limitation: The available description does not include dimensions. Avoid choosing it based only on the 6-inch label if your stove collar’s oval measurements are unknown.
LLPParts 7-Inch Oval-To-Round Adapter
This black, 24-gauge adapter is described as a single-wall 7-inch wood stove pipe oval-to-round fitting and a replacement for Gray Metals OEM. The listing also provides the product code 7X7-610-3PC and states a one-year warranty. Its stated 7-inch size distinguishes it from the 6-inch options.
Best for: Buyers whose appliance collar and venting plan call for a 7-inch oval-to-round transition. It is the relevant choice in this group when a 6-inch adapter would not match the specified pipe diameter.
- Choose this if your system is designed for 7-inch round pipe and the oval side matches your appliance.
- Confirm the actual collar dimensions and the adapter’s insertion orientation before installation.
Limitation: The supplied features do not state the oval-end measurements or overall height. Do not infer that the oval opening matches the 6-inch model.
AllFuel HST 6-Inch Stove Collar Adapter
This adapter is designed to connect single-wall stove pipe to a heating appliance. The listing says the crimped end attaches to the appliance. It is made from 21-gauge steel and has a high-temperature black-painted finish. Unlike the oval-to-round models, its description does not identify an oval or rectangular inlet.
Best for: Buyers who need a 6-inch single-wall stove collar connection and whose appliance and pipe use the fitting arrangement specified by the product. Its stated 21-gauge construction is a useful comparison point for shoppers considering material thickness.
- Choose this for the listed single-wall-to-appliance connection, not as a confirmed shape converter.
- Check which end connects to the appliance; the product description identifies the crimped end.
Limitation: The listed information does not establish a rectangular-to-round or oval-to-round conversion. Confirm the required fitting type before treating it as a substitute.
Moxweyeni 6-To-5-Inch Stove Pipe Reducer
This black matte reducer changes pipe diameter from 6 inches to 5 inches. The listing says the 6-inch side fits into 6-inch flexible duct and the other side fits 5-inch ducting. It identifies the 5-inch collar as crimped and the 6-inch collar as not crimped, and describes installation as requiring no tools.
Best for: Buyers who need a round 6-to-5-inch size transition and have confirmed that their appliance and vent system allow that diameter change. It is included as a related adapter option, not as a shape converter.
- Choose this when the required change is pipe diameter, not rectangular or oval geometry.
- Check the crimped and uncrimped ends against the direction and connection style needed.
Limitation: It does not convert a rectangular or oval opening to round. The listing’s general fit language does not replace checking appliance requirements and venting instructions.
Buying Guide: How To Choose A Stove Pipe Adapter
Is the opening rectangular or oval?
Start by identifying the actual shape of the stove outlet. The products in this selection are described primarily as oval-to-round adapters, single-wall collar fittings, or round diameter reducers. None of the supplied product details clearly identifies a rectangular-to-round adapter. A rectangular outlet should not be treated as oval based on appearance alone.
Measure the opening at the point where the adapter must fit. Record width, height, and any relevant collar depth. For a non-round opening, also note whether the adapter must fit over the collar or insert inside it. A fitting that has the right nominal round size can still be wrong at the appliance end.
What round pipe diameter do you need?
Match the round end to the venting system’s specified diameter. The listed oval-to-round models are categorized as 6-inch or 7-inch products, while the Moxweyeni reducer changes a 6-inch connection to 5 inches. Do not choose a smaller or larger diameter simply because an adapter is available; check the appliance manual and venting design first.
Also distinguish nominal pipe size from the fitting’s actual measured opening. The LLPParts 6-inch listing gives a 6-1/8-inch round side that accepts crimped 6-inch pipe. That detail illustrates why it is useful to check the stated connection method, not just the size printed in a product name.
Which end should connect to the stove?
Connection orientation matters. A crimped end may be intended to insert into another pipe or attach to the appliance, depending on the product design. The AllFuel HST listing specifically says its crimped end attaches to the appliance. The LLPParts 6-inch listing says its oval side is crimped to fit inside the stove’s oval part.
Before buying, compare the fitting’s end descriptions with your stove collar and pipe. Do not assume all adapters use the same direction. If the listing does not provide enough detail, seek manufacturer or seller clarification.
Does the adapter match the venting system?
Check whether the product is intended for single-wall pipe, a particular appliance connection, or a specific pipe diameter. The AllFuel product is described for single-wall stove pipe. The 7-inch LLPParts product is identified as single-wall, while the Hohnezl product supplied in the catalog is a different type: a single-wall-to-double-wall chimney adapter. That type of fitting does not answer a rectangular-to-round need.
Use the stove and chimney manufacturers’ installation instructions to determine the correct components. A shape or diameter adapter should not be used to bypass requirements for the appliance, chimney, clearances, or approved vent configuration.
What product details should you verify?
- Appliance outlet shape and measured dimensions.
- Round pipe diameter and whether the pipe end is crimped.
- Which adapter end inserts into the stove collar or pipe.
- Single-wall or other venting-system designation.
- Adapter height and material details when they affect the planned connection.
- Whether the product description explicitly supports the conversion you need.
Product descriptions vary in how much detail they provide. The LLPParts 6-inch listing supplies oval dimensions and overall height, while the Imperial listing supplied here states only the product type, size, and color. When dimensions are missing, verify them before ordering rather than assuming the products are interchangeable.
Frequently Asked Questions
Are oval-to-round and rectangular-to-round adapters the same?
No. Oval and rectangular are different opening shapes. The products listed here are described as oval-to-round, round reducers, or other stove-pipe connectors. The supplied information does not confirm a rectangular-to-round model.
Which listed adapter is for a 6-inch round pipe?
The LLPParts 6-inch oval-to-round adapter and Imperial 6-inch oval round adapter are the products specifically identified as 6-inch oval-to-round options. The LLPParts listing provides additional dimensions; the Imperial details provided do not.
Can a 6-to-5-inch reducer convert an oval collar to round pipe?
No. The Moxweyeni reducer changes round pipe diameter from 6 inches to 5 inches. Its listed features do not describe an oval or rectangular inlet.
How do I know whether I need the 6-inch or 7-inch model?
Check the required vent diameter in the appliance instructions and measure the existing pipe. The 6-inch and 7-inch models are not interchangeable based only on their similar oval-to-round purpose.
What if the adapter listing does not provide the oval dimensions?
Compare the appliance collar measurements with manufacturer or seller information before ordering. The Imperial product details supplied here do not state the oval dimensions, so the 6-inch label alone is not enough to confirm a fit.