Advanced Drainage Systems 0465AA Downspout Adapter

Product Description

The ADVANCED DRAINAGE SYSTEMS 0465AA is a downspout adapter designed to transition a rectangular downspout opening to a round poly drain tube. It connects a 3 inch by 4.25 inch rectangular downspout outlet to a 4 inch round polyethylene drain tube, making it a standard fitting for residential and light commercial roof drainage systems. This adapter is installed at the base of a downspout to direct roof runoff into an underground or surface drain line. Plumbers, drainage contractors, and experienced DIYers working on gutter and stormwater systems will find this a straightforward, code-compatible solution for that critical transition point.

This adapter fits the most common residential downspout profile — the 3 inch by 4.25 inch rectangular outlet — and steps it down into a 4 inch round poly drain tube. It is used where gutter downspouts connect to buried drain lines, French drain systems, or surface conveyance piping. Typical installations include residential foundation drainage, yard drainage, and commercial gutter-to-underground-drain tie-ins. The poly construction resists corrosion and handles the temperature cycling and UV exposure common in outdoor drainage applications.

Key Features

• Transitions a 3 inch by 4.25 inch rectangular downspout to a 4 inch round poly drain tube
• Polyethylene construction resists corrosion, UV exposure, and freeze-thaw cycling
• Designed for direct connection at the downspout base, no special tools required
• Sold individually; compatible with standard 4 inch round corrugated or smooth poly drain pipe

Compatibility

Designed as an OEM-style replacement and new-installation fitting for 3 inch by 4.25 inch rectangular downspout outlets transitioning to 4 inch round polyethylene drain tube systems.

Installation Notes

Installation is typically performed by plumbers or drainage contractors working on stormwater and gutter discharge systems. No special tools are required for most installations, though a utility knife may be needed to trim pipe ends for a clean fit. Ensure the drain tube connection is secure and properly sloped per local drainage codes before backfilling any trench. Inspect the outlet opening on the downspout for deformation or obstructions before fitting the adapter.

Technical Specifications

• Inlet Size: 3 inches x 4.25 inches (rectangular downspout)
• Outlet Size: 4 inches round
• Material: Polyethylene
• Weight: 2.96 pounds
• Unit of Measure: Each
• Package Quantity: 20

Standard Information

• Brand: ADVANCED DRAINAGE SYSTEMS
• Manufacturer Part Number: 0465AA