3x4" to 3" Professional Downspout Adapter Reducer - 30 Aluminum

3x4" Rectangular Inlet | 3" Round Outlet | 30 Gauge Aluminum | 25+ Colors

3x4" to 3" Aluminum Downspout Adapter

Create a clean, professional transition from a 3x4" rectangular downspout into a 3" round drain opening. This 30 gauge aluminum adapter helps move roof runoff into underground drainage, corrugated tile, SDR drain pipe, concrete drain holes, and exterior water-routing systems without forcing mismatched shapes together.

3x4" Rectangular Inlet

3" Round Outlet

30 Gauge Aluminum

25+ Colors

Drainage Connection

Size, Color, and Ordering Details

Product: 3x4" to 3" Aluminum Downspout Adapter.

Inlet size: 3x4" rectangular downspout connection.

Outlet size: 3" round outlet for drain openings, round pipe, SDR pipe, or corrugated tile connections when compatible.

Material: 30 gauge aluminum.

Finish: powder-coated aluminum in 25+ color options.

Minimum order: 2 pieces.

Weight: 0.372 lb.

Best use: underground drainage connections, concrete drain openings, round drain pipe transitions, corrugated tile tie-ins, downspout upgrades, and professional gutter drainage work.

Clean Transition from Downspout to Round Drain Opening

A 3x4" rectangular downspout and a 3" round drain opening do not naturally fit together. This adapter bridges that shape change so roof runoff can move from the gutter system into the drainage path with a cleaner connection and a more finished appearance.

Use it when a downspout needs to discharge into a round drain hole, underground pipe, SDR drain pipe, corrugated tile, concrete sleeve, or exterior water-routing system.

Helps Avoid Loose, Sloppy Drain Connections

When the downspout does not match the drain opening, installers can end up with gaps, loose edges, poor alignment, splashback, exposed pipe ends, and extra field work. This adapter gives the connection the correct shape change from rectangular to round, helping the finished drainage setup look cleaner and function better.

It is a small part that makes a big difference at the base of the downspout, where water control, appearance, and fit all matter.

Color-Matched Aluminum for a Cleaner Exterior Finish