The Garantia Column Tank is a 330-litre rainwater harvesting butt with a Roman column-style design — a practical storage solution that doubles as a garden feature. Manufactured by Graf, sold under their Garantia range, it connects to your downpipe to collect naturally soft rainwater for garden irrigation. Built from 100% recycled plastic, with a threaded tap connection that requires no drilling.
Key features
330L capacity – high-volume storage in a compact, slim-profile column shape
Roman column design – Grey finish works as a garden focal point rather than something to hide away
Threaded tap connection – tap installs without drilling
Tap included
100% recycled plastic construction – UV-stable and weather-resistant
Connecting to your downpipe
A downpipe diverter is required separately — add one to your order below. If you're connecting to a square downpipe, you'll need the Square Downpipe Diverter specifically.
Per Graf's installation guidance: "The water butts do not come predrilled. This product is very easy to use and can be drilled in by anyone. Simply attach the drill bit onto your drill and begin drilling – remember you must drill the hole in the water butt at the same level as the hole in the downpipe! As long as the holes drilled in both the water butt and the downpipe are level, the water will continue down the downpipe when the water butt is full."
The Garantia Column Tank is a 330-litre rainwater harvesting butt with a Roman column-style design — a practical storage solution that doubles as a garden feature. Manufactured by Graf, sold under their Garantia range, it connects to your downpipe to collect naturally soft rainwater for garden irrigation. Built from 100% recycled plastic, with a threaded tap connection that requires no drilling.
Key features
330L capacity – high-volume storage in a compact, slim-profile column shape
Roman column design – Grey finish works as a garden focal point rather than something to hide away
Threaded tap connection – tap installs without drilling
Tap included
100% recycled plastic construction – UV-stable and weather-resistant
Connecting to your downpipe
A downpipe diverter is required separately — add one to your order below. If you're connecting to a square downpipe, you'll need the Square Downpipe Diverter specifically.
Per Graf's installation guidance: "The water butts do not come predrilled. This product is very easy to use and can be drilled in by anyone. Simply attach the drill bit onto your drill and begin drilling – remember you must drill the hole in the water butt at the same level as the hole in the downpipe! As long as the holes drilled in both the water butt and the downpipe are level, the water will continue down the downpipe when the water butt is full."
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