40mm Downpipe Adapter for water butts

40mm water butt downpipe adaptor fits perfectly on to 40mm downpipes which are often used on sheds, greenhouses and garages.

This adaptor fits to FLO PLAST mini line Stopend Outlet 76/50 (without using a 50mm downpipe) (Can be used with 19mm or 25mm barbed connector)

This adaptor fits over the outside of the 40mm 38mm and 36mm downpipes.

It can be purchased with either a 19mm connector that fits 19mm inner diameter/25mm outer diameter tubing which fits to a Rainwater Terrace or a other water butt

It can also be purchased with a 25mm connector that fits 25mm inner diameter/32mm outer diameter tubing to a water butt.

This listing is for the adapter only. Tubing and downpipe is not included.

If you require any assistance with a custom water butt set up please call our office on 01937 845176.

Additional (25mm & 32mm OD) inlet & outlet pipes can be found HERE 

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Customer Reviews

Based on 6 reviews
Excellent customer service

I bought the adapter for my greenhouse downpipe, but needed an additional section to make it fit. Very helpful advice on the phone, and the additional piece worked first time. Thanks!

Greenhouse Water

After a lot of online research I did not think at one point that I could find these adapters for my greenhouse downpipes to feed water butts but am very pleased with the outcome. They worked absolutely fine and were simple to connect. Well done Rainwater Terrace for thinking of this idea. I have put your site in my favourites in case there is some other gem you might have.

Water butt connection

I needed to connect my water butt to the 40mm downpipe on my green house. This adapter worked perfectly and my butt is now filling up nicely. The person I spoke to on the phone was very helpful and the adapter arrived very quickly.

Just what we needed!

Having realised that the water butt we bought from a different company didn’t have the right attachment for our pipes we found this adapter. Did the job perfectly. Very easy transaction.


Only place I could find this size adaptor, so easy to fit water butt to greenhouse

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