plusgutter 11.5ft Long Gutter Downspout Extensions Flexible,

The Verdict

Standing water pooling against your foundation is one of those problems you don’t notice until you’re pricing basement waterproofing. The plusgutter 11.5ft Flexible Downspout Extension is a $26 fix that solves it — provided you understand what you’re buying.

What You Actually Get

The package contains a single 11.5-foot corrugated polypropylene tube, two metal mounting brackets with screws, and a pre-attached elbow that connects to your existing downspout. No additional parts needed for a standard 2x3 or 3x4 downspout. At 11.5 feet, this is roughly double the length of most rigid PVC extensions you’ll find at big-box stores, which typically max out around 5 feet.

The flexible design is the headline feature. Unlike rigid pipe, this bends around corners, follows the contour of your yard, and can be tucked against the foundation wall. The corrugated ribbing provides crush resistance — you can step on it without flattening it.

Real-World Performance

Installation took me about 10 minutes. The elbow slides directly onto the downspout outlet, and the two included brackets anchor the extension to your siding or foundation. No glue, no measuring, no cutting. That’s the entire appeal.

In testing, the key metric is simple: does water exit 10+ feet from the foundation? Yes. On a moderate rain, the water runs the full length and disperses at the far end. The flexible body handles a 90-degree bend without kinking — this is where cheaper corrugated hoses fail, collapsing at the bend point and backing water up.

One thing that surprised me: the material doesn’t get brittle in winter. The polypropylene stays flexible down to freezing temperatures, unlike PVC which can crack. Several buyers in northern climates confirmed this. As one reviewer put it, “Survived a Minnesota winter with zero cracking. The rigid stuff I had before split in two places by February.”

What Buyers Consistently Praise

The 4.5-star rating across 225 reviews is earned. The most common praise centers on length and flexibility. One verified buyer noted: “My downspout was 12 feet from the street. This thing actually reaches. No more muddy mess next to the garage.”

Another recurring theme is value — at $25.99, it’s cheaper than buying two 5-foot rigid sections plus connectors, and it installs in a fraction of the time.

Where It Falls Short

The corrugated interior is the double-edged sword. It flexes, but it also catches debris. Leaves, pine needles, and small gravel will accumulate inside over a season. You’ll want to flush it with a hose every few months or you’ll notice reduced flow.

The lightweight plastic also has a tendency to shift during heavy downpours if the outlet end isn’t anchored. The included brackets secure the starting end, but the far end can wander. A landscape staple or a brick on the outlet solves this in 30 seconds.

No spray cap is included. Water exits as a concentrated stream, which can erode soil at the discharge point over time. A $5 splash block or a cheap DIY gravel pit solves this, but it’s worth knowing before you buy.

Who Should Buy This

Buy it if: your downspout is 8–12 feet from a drainage area or street, you want an install that takes minutes instead of an afternoon, or you’ve cracked rigid PVC extensions in the past. It’s also a solid choice for renters — it installs without permanent modification and removes cleanly.

Skip it if: you need a 20-foot run (this won’t stretch), you’re dealing with heavy debris from overhanging trees (consider a smooth-wall rigid system), or you want a finished, permanent look — the corrugated black plastic is utilitarian, not pretty.

FAQ

Will this fit my downspout? It fits standard 2x3 and 3x4 downspouts. The included elbow has a slightly oversized opening that slides over most outlets. For unusual sizes, a universal downspout adapter will bridge the gap.

Can I bury it underground? Technically yes, but the corrugated wall isn’t designed for soil pressure and will eventually collapse. Use solid PVC if you’re going underground.

How do I clean it? Detach the elbow and run a garden hose through it, or use a drain snake for stubborn clogs. Doing this twice a year keeps flow at full capacity.

The Verdict

Rating: 4.6/5 — The plusgutter 11.5ft is the best value in flexible downspout extensions under $30. It solves a real problem — water pooling near foundations — with minimal effort and genuine 4-season durability.

Buy it if you want a quick, effective fix for a downspout that’s dumping water too close to your house.

Skip it if you need a permanent, debris-resistant solution or a run longer than 12 feet.

For the price of a pizza dinner, you’re protecting your foundation from a five-figure repair. That math works.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.