A solid joint to clamp
Tape alone gives flexible duct nothing firm to hold. The aluminum sleeve slides inside both sections, so your clamps and sealant grip a rigid core and the joint keeps its round shape.
Aluminum Duct Connector, 4 in, Joins Flexible or Rigid Duct for HVAC and Ventilation Runs, 28 Gauge with Center Bead, Lambro 244-36
A simple 4 in aluminum sleeve that joins two duct sections into one sealed run.
$4.99$6.99CurbGo Savings: Save $2
- 4 in diameter
- 28 gauge aluminum
- Center bead
- Crimped both ends
- Joins 3 duct types
Estimated arrival
Enter your ZIP for a delivery date
Ships to the lower 48 states with tracking.
Why buy from CurbGo
- Risk-free 30-day returnsUnused, in the original packaging
- U.S.-based home goods retailerReal U.S.-based support, before and after
Turn two short runs into one continuous, sealable line
At a Glance
- 4 in diameter: for standard 4 in duct
- 28 gauge aluminum: crimped on both ends
- Center bead: helps hold each section in place
- 3 duct types: flexible foil, insulated flex, or rigid pipe
- Sold each: one connector per order
When a duct run comes up short, or you need to join a new section to an old one, a connector does the job without replacing the whole line. The Lambro 244-36 is a 4 in, 28 gauge aluminum sleeve crimped on both ends with a raised center bead, made to join two sections of flexible foil duct, flexible insulated duct, or rigid pipe. Slide each section on, clamp or strap it, and seal the seams with code-approved mastic or sealant.
Key Features
- Joins three duct types: connects flexible foil, flexible insulated duct, or rigid pipe.
- 28 gauge aluminum: a light sleeve that will not rust.
- Crimped both ends: makes it easier to slip duct sections into place.
- Raised center bead: helps hold each section in position at the middle.
- HVAC ready: suited to most heating, venting, and air conditioning applications.
What's Included
In the box: one Lambro 244-36 4 in aluminum duct connector. Clamps or tie straps are required and sold separately.
Before You Buy
- Do not use it on a clothes dryer duct. This connector is not made for clothes dryer installations. Use it on heating, venting, and air conditioning runs.
- It fits 4 in duct only. Match it to 4 in flexible foil, insulated flex, or rigid pipe.
- Clamps or tie straps are required. They are not included, so pick up two sized for 4 in duct.
- Seal every seam. Always seal both joints with code-approved mastic or sealant.
Perfect For
- Extending a 4 in duct run that comes up short
- Repairing a torn section of flexible duct
- Joining insulated flex to rigid pipe
- Ventilation and HVAC projects in attics and crawl spaces
Care & Use
- Push each duct section up to the center bead.
- Secure both ends with clamps or tie straps.
- Seal both seams with code-approved mastic or sealant.
- Support long duct runs so the joint is not carrying the weight.
Shipping
Your order is packed with care and tracked door to door. Ships fast from CurbGo with tracking.
Why a duct connector beats a patch job
Mix duct types
Join flexible foil to insulated flex, or either one to rigid pipe. One 4 inch connector bridges the gap so you can reuse good duct and only replace the damaged stretch of the run.
Small part, big save
When a run ends a foot short of the vent, you do not need a whole new length. Add a section, join it with this connector, seal the seam, and the job is finished.
Connector specs
Sized for the most common household duct.
4 in
Duct diameter
28 ga
Aluminum gauge
3
Duct types it joins
Why use a duct connector?
vs. taping duct ends together
Tape alone can loosen over time. A rigid sleeve gives both sections something solid to clamp onto before sealing.
vs. replacing the whole run
Swapping an entire duct takes time and material. A connector adds length or repairs one section with a single small part.
vs. a duct reducer
A reducer changes duct sizes. This connector keeps the run at 4 in from end to end.
Fits your duct run
A short aluminum sleeve sized for standard 4 in duct.
- Diameter
- 4 in
- Material
- 28 gauge aluminum
- Slips between two 4 in duct sections in an attic, crawl space, or ceiling run.
- Leave room around the joint to tighten clamps and apply sealant.
Full Specifications
Every detail, measured and listed
| Brand | Lambro |
|---|---|
| Model | 244-36 |
| Type | Duct connector |
| Diameter | 4 in |
| Material | Aluminum, 28 gauge |
| Ends | Crimped on both ends |
| Center bead | Yes |
| Works with | Flexible foil duct, flexible insulated duct, rigid pipe |
| Use | Heating, venting, and air conditioning |
| Not for | Clothes dryer installations |
| Clamps or straps | Required, not included |
| Quantity | 1 connector |
| MPN | 244-36 |
FAQs
Common questions that customers ask
Can I use this duct connector on a dryer vent?
No. The Lambro 244-36 is not made for clothes dryer installations. Use it on heating, venting, and air conditioning duct.
What kind of duct does a 4 in aluminum connector fit?
It joins two sections of 4 in flexible foil duct, flexible insulated duct, or rigid pipe.
Do I need clamps?
Yes. Clamps or tie straps are required to hold each section and are sold separately.
Should I seal the joint?
Always seal both seams with code-approved mastic or sealant after clamping.
How fast will it ship and can I return it?
Orders ship to the 48 contiguous states and process within 2 business days. If it is not right, you have 30 days from delivery to return unused items in the original packaging.
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CurbGo hunts for the well-made version of everyday things and skips the markup. Lambro has made venting and duct parts for American homes for decades, and its connectors are a fixture in hardware store duct aisles. The 244-36 is classic Lambro: a plain, well-formed aluminum sleeve that does one job right.
Join your 4 in duct the right way
Fast shipping. 30-day returns. One 4 in aluminum connector for HVAC runs.
