A downpipe diverter is the simplest way to start collecting rainwater: it sits in the downpipe, filters out leaves and debris, and sends the water sideways into a tank or barrel instead of down the stormwater line. Blue Mountain Co's range covers four versions, and the right one depends on the downpipe's shape and how the water needs to get from the diverter to the tank.
Downpipe Diverter Hose Kit
The Downpipe Diverter Hose Kit ($29.94) is the connector piece, not a diverter in its own right — it links a downpipe diverter to a rain barrel so the diverted water actually reaches storage. If a barrel setup needs connecting up, this is usually the missing link rather than another diverter.
Round diverters: standard vs Quickfit
The Downpipe Diverter Round 90mm ($39.99) is the standard fit for a round 90mm downpipe — cut into the pipe, filters debris, redirects flow. The Quickfit Downpipe Diverter ($39.99, suits both 90mm and 100mm) is built for a faster install without needing to cut and reseal the pipe the same way, which is worth the convenience on a retrofit where the downpipe is already fully plumbed and painted.
Rectangular downpipes
Not every downpipe is round. The Rectangular Downpipe Diverter ($49.95, suits 100x50mm and 100x75mm profiles) does the same job — capturing flow while filtering debris — on the rectangular profile common on older homes and some commercial buildings.
Choosing between them
Start with the downpipe's actual shape and size: round 90mm gets the standard round diverter, a rectangular profile needs the rectangular version, and if the install needs to avoid cutting into an already-finished downpipe, the Quickfit is the easier retrofit. Whichever diverter is chosen, check whether the destination is a rain barrel (in which case the hose kit is needed to complete the connection) or a hard-plumbed tank line.
See the full range in our Downpipe Diverters & Outlets collection, part of the wider Blue Mountain Co rainwater harvesting range.
Frequently Asked Questions
What's the difference between the standard round diverter and the Quickfit?
Both suit round downpipes and do the same filtering/diverting job. The Quickfit is designed for a faster retrofit install without the same amount of cutting into the existing pipe.
Do I need the Hose Kit as well as a diverter?
Only if the water is going into a rain barrel — the Hose Kit is the connector between the diverter and the barrel, not a diverter itself.
My downpipe isn't round — can I still divert water from it?
Yes. The Rectangular Downpipe Diverter is built for 100x50mm and 100x75mm rectangular profiles.
Will a downpipe diverter stop all debris reaching my tank?
It filters leaves and larger debris, but for finer screening or first-flush water quality, pair it with a Clean Rain inlet screen or a first flush diverter.