Rectangular Cast Iron Downpipes

Rectangular cast iron downpipes are a traditional alternative to round rainwater pipes, often used on period homes, listed buildings, churches and restoration projects. The straight-sided profile gives them a more architectural appearance, and they work especially well where an existing rectangular system needs replacing.

Our range uses a 4 x 3" profile, roughly 100 x 75mm, with several pipe lengths and fittings available. You can choose between eared downpipes, where fixing ears are cast directly into the pipe, or uneared versions used with separate pipe brackets. Primed and pre-painted black finishes are available across the range.

Matching components include offsets, shoes, anti-splash shoes, branches, connectors and access fittings, so you can put together more than a simple straight drop. We stock cast iron hoppers with 4 x 3" rectangular outlets too, useful where several rainwater sources need to feed into one pipe.

If you’re replacing old rectangular downpipes, measure both sides of the pipe before ordering. It’s worth checking the socket arrangement and fixing method too, since older systems can vary.

For different shapes and diameters, browse our full cast iron downpipes range. You can find matching gutters and rainwater fittings in our main cast iron guttering collection.

If you’re not certain which parts you need, send us a few photos and measurements. We can usually help work out the closest match.