Name: FLEX Drain by Amerimax 4-in x 3-in x 4-in 45 -Degree Corrugated Downspout Adapter Fittings
Brand: FLEX Drain by Amerimax
SKU: 4777227
Price: 11.68 USD
Availability: InStock
Rating: 4.3 (153 reviews)

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The FLEX-Drain 3 in. x 4 in. downspout adapter features flexible construction to fit the majority of angles. This adapter is ideal for DIY applications. FLEX-Drain helps you get the job done faster and easier, with professional grade durability and more versatility than traditional corrugated pipe. Flexible and expandable, FLEX-Drain easily bends around any obstacle, hold its shape during installation and with a simple snap, its integrated soil-tight fittings lock securely and stay connected during backfilling. FLEX-Drain is a complete drainage solution system that's widely compatible with virtually all traditional 3 in. and 4 in. corrugated pipe and 4 in. PVC. Technologically superior, it's made with no-break copolymers and exceeds all applicable ASTM crush standards.

Fits 3 inch x 4 inch corrugated pipe and 4 inch PVC pipe
Expand, bend and shape to fit offset pipe
Flexible and expandable
Expands up to 12-in

General
Sub Type	Corrugated	Common Use	This piece is used to connect downspouts to FLEX-Drain, 4-in standard Corrugated Pipe, 4-in PVC Pipe and most other 4-in pipe
Type	Downspout adapter	Material	Polypropylene
Package Quantity	1	Maximum Working Temperature (Fahrenheit)	150

Dimensions
Length Measurement	8-in	Fits Pipe Size	3-in x 4-in
Diameter Measurement	4-in	Size - Length	12-in

Features
Minimum Working Temperature (Fahrenheit)	-50	Flexible	Yes
Degree of Angle	45

Certifications
CA Residents: Prop 65 Warning(s)	No	Safety Listing	Not safety listed

Warranty
Warranty	30-day limited

Compatibility
Code Approvals	ASTM

Miscellaneous
UNSPSC	70171800

Check out the Best Selling Corrugated Drainage Pipe Fittings on Lowes.com

Review

4.3 out of 5

153 Reviews

68% Recommend this product

Ratings may include incentivized customer reviews.

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What Customers Are Saying

Customers overwhelmingly praise this drainage connector for its effectiveness in redirecting water away from foundations and preventing yard flooding. Most highlight the easy screw-on installation requiring no special tools, flexible design that adapts to uneven connections, and durable construction that feels solid and long-lasting. Many appreciate its ability to work with both 2x3 downspouts and 4-inch corrugated pipes, and that it can be cut to size with scissors for custom applications. Several note it solved drainage issues without costly pipe replacements. A few report sizing inconsistencies or connections that separate over time, though most consider it reliable and worth the investment.

Customer review summary generated by AI, including incentivized reviews.

153 Customer Reviews

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Irrigation Pipes

Would Recommend

The right drainage pipe and the right fitment.

HKH68September 5, 2026
From 4-in x 2-in x 3-in 45 -Degree Corrugated Downspout Adapter Fittings Verified Purchaser

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Did not like

Would Not Recommend

They did not fit on my standard gutter. Came off constantly. I found better fitting ones at another major retail hardware store and bought those and returned four of the six I bought that still had the QR codes left on them.

WilliamSeptember 4, 2026
Verified Purchaser

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COMPARE PRODUCTS

		Name	Current Item FLEX Drain by Amerimax4-in x 3-in x 4-in 45 -Degree Corrugated Downspout Adapter Fittings
		Ratings	153
		Length Measurement	8-in
		Package Quantity	1
		Sub Type	Corrugated
ADS6-in x 6-in Corrugated Snap Coupler Fittings	ADS4-in x 4-in Corrugated Downspout Adapter Fittings	ADS3-in x 4-in Corrugated Downspout Adapter Fittings	ADS4-in x 4-in Corrugated Inside Coupling Fittings	ADS4-in x 4-in 90 -Degree Corrugated Elbow Fittings	ADS4-in x 4-in 45 -Degree Corrugated Wye Fittings	ADS4-in x 4-in 90 -Degree Corrugated Tee Fittings	Amerimax Flex-A-Spout Brown 2-Pack Expandable Corrugated Downspout Extension Fits 2-in x 3-in and 3-in x 4-in	ADS6-in x 6-in Corrugated Coupling Fittings
35	359	200	208	216	218	204	1	25
7-in	4-4/5-in	4-4/5-in	4-in	7-in	10-in	8-in	27-1/2-in	5-1/2-in
1	1	1	1	1	1	1	1	1
Corrugated	Corrugated	Corrugated	Corrugated	Corrugated	Corrugated	Corrugated	Corrugated	Corrugated