The Best Rain Barrel Diverter Kit
Researched by Johnny Alto · last updated July 29, 2026
Short answer: The best rain barrel diverter kit is the EarthMinded DIY Rain Barrel Diverter Kit (3x4 Downspout). The most complete turn-any-container-into-a-rain-barrel system: it includes the diverter, a spigot, and the barrel-side fittings, and its flex hose is auto-overflow by design, so once the barrel is full, incoming water bypasses back down the downspout instead of backing up, which is the single most important safety feature since it keeps water away from your foundation without you doing anything. The main things to weigh are measure your downspout first, overflow behavior, winter, and install height and hose.
EarthMinded DIY Rain Barrel Diverter Kit (3x4 Downspout)
The most complete turn-any-container-into-a-rain-barrel system: it includes the diverter, a spigot, and the barrel-side fittings, and its flex hose is auto-overflow by design, so once the barrel is full, incoming water bypasses back down the downspout instead of backing up, which is the single most important safety feature since it keeps water away from your foundation without you doing anything. The honest limits: you must buy the correct downspout-size variant (2x3 vs 3x4 vs round), the DIY drilling into the barrel and downspout intimidates some buyers, the plastic diverter body is functional rather than premium, and it needs winterizing in freezing climates (a cover plate is included in some SKUs but not all).
Check price on Amazon Live price on Amazon. Representative image.A downspout diverter lets you harvest roof rainwater into a barrel without cutting the downspout out or leaving a barrel that overflows onto your foundation. You cut a hole in the downspout, insert the diverter, and run a short hose to the barrel; when the barrel fills, water simply continues down the spout. It is for homeowners who want a tidy, semi-permanent rain-harvesting setup and care about the two failure points: matching their downspout size, and safe overflow. Here is the pick, a cheap option, and the winter rule.
How do the best options for rain barrel diverter kit compare?
| Pick | Product | Why it makes the list |
|---|---|---|
| Top pick | EarthMinded DIY Rain Barrel Diverter Kit (3x4 Downspout) | The most complete turn-any-container-into-a-rain-barrel system: it includes the diverter, a spigot, and the barrel-side fittings, and its flex hose is auto-overflow by design, so once the barrel is full, incoming water bypasses back down the downspout instead of backing up, which is the single most important safety feature since it keeps water away from your foundation without you doing anything. |
| Best cheap / simplest | Oatey Mystic Rainwater Collection System (2x3) | Under about 20 dollars, easy install, with a 4-foot hose and a center-channel debris bypass in a paintable UV-resistant housing. It fits only 2x3 downspouts and is a basic diverter with simpler flow handling than auto-overflow. |
| Best filtering / dual-barrel | Fiskars Rain Barrel DiverterPro Kit | A removable clear-door debris filter, a larger 3x4 internal diameter for better capture in heavy rain, fits both 2x3 and 3x4, can feed barrels on either side, and auto-returns overflow. It is more expensive, and the filter needs periodic cleaning. |
| Same brand, 2x3 with winter cover | EarthMinded DIY Diverter (2x3, with Winter Cover) | The same trusted system sized for the common 2x3 spout and bundled with the freeze-season cover. It is 2x3 only, so confirm your downspout before buying. |
What should you look for in rain barrel diverter kit?
A few things separate a good rain barrel diverter kit from a frustrating one: measure your downspout first, overflow behavior, winter, and install height and hose. Weigh these before you buy.
- Measure your downspout first: kits are size-specific (2x3, 3x4, or round 3-inch/4-inch), and buying the wrong size is the number-one return reason, since a 3x4 diverter will not seal in a 2x3 spout.
- Overflow behavior: prefer a diverter that auto-returns excess water down the downspout when the barrel is full (EarthMinded, Fiskars); never rely on the barrel's own overflow port alone, or you pool water at the foundation.
- Winter: in freezing climates disconnect or cap the diverter and drain the barrel, and a winter cover plate reseals the downspout so it drains normally and the diverter does not crack from trapped ice.
- Install height and hose: mount the diverter slightly above the barrel's max fill line with a short, downward-sloping hose, and debris-bypass designs reduce clogging from roof grit and leaves.
Measure the downspout, plan the overflow
Two things decide whether a downspout diverter works or becomes a headache. First, size: downspouts come in 2x3-inch, 3x4-inch, and round formats, and a diverter for one will not seal in another, so measure your downspout before ordering, since a mismatch is the top reason these get returned. Second, overflow: the whole risk with rain harvesting is what happens when the barrel fills, and a poorly designed setup backs water up and pools it against your foundation, which is exactly what you were trying to avoid. A good diverter auto-returns the excess back down the downspout once the barrel is full, so you never have to babysit it. In freezing climates, add the winter step: drain the barrel and cap or cover the diverter so trapped ice does not crack it and the downspout drains normally.
What are the best alternatives?
Oatey Mystic Rainwater Collection System (2x3)
Under about 20 dollars, easy install, with a 4-foot hose and a center-channel debris bypass in a paintable UV-resistant housing. It fits only 2x3 downspouts and is a basic diverter with simpler flow handling than auto-overflow.
Check price on AmazonFiskars Rain Barrel DiverterPro Kit
A removable clear-door debris filter, a larger 3x4 internal diameter for better capture in heavy rain, fits both 2x3 and 3x4, can feed barrels on either side, and auto-returns overflow. It is more expensive, and the filter needs periodic cleaning.
Check price on AmazonEarthMinded DIY Diverter (2x3, with Winter Cover)
The same trusted system sized for the common 2x3 spout and bundled with the freeze-season cover. It is 2x3 only, so confirm your downspout before buying.
Check price on AmazonBottom line: the complete EarthMinded kit is the pick that harvests roof rain and safely auto-overflows back down the spout (buy the size matching your downspout); the Oatey Mystic is the cheap simple option and the Fiskars adds a debris filter. Measure the downspout and winterize in freezing climates. Pair it with our composting and growing guides.
Frequently asked questions
What is the best rain barrel diverter kit?
EarthMinded DIY Rain Barrel Diverter Kit (3x4 Downspout). The most complete turn-any-container-into-a-rain-barrel system: it includes the diverter, a spigot, and the barrel-side fittings, and its flex hose is auto-overflow by design, so once the barrel is full, incoming water bypasses back down the downspout instead of backing up, which is the single most important safety feature since it keeps water away from your foundation without you doing anything.
What should you look for in rain barrel diverter kit?
Focus on measure your downspout first, overflow behavior, winter, and install height and hose.
What is a good alternative to the EarthMinded DIY Rain Barrel Diverter Kit (3x4 Downspout)?
The Oatey Mystic Rainwater Collection System (2x3). Under about 20 dollars, easy install, with a 4-foot hose and a center-channel debris bypass in a paintable UV-resistant housing. It fits only 2x3 downspouts and is a basic diverter with simpler flow handling than auto-overflow.
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This is a research-based buying guide, not a personal hands-on review; recommendations reflect community consensus and verified buyer reviews. Prices and availability are subject to change, so always confirm on Amazon. As an Amazon Associate I earn from qualifying purchases. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.
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