WWilts Posted July 27, 2022 Share Posted July 27, 2022 New build in progress. Highly permeable site down to permeable bedrock. Qu. How to connect 68 or 80mm downpipe to 63mm twinwall pipe? Link to comment Share on other sites More sharing options...
PeterW Posted July 27, 2022 Share Posted July 27, 2022 Twin wall being used for what ..? Connection to underground soakaways ..? 63mm OD twin wall is 50/51mm ID so you would have to use something like a spigot adapter however it will significantly reduce flow rates so it needs proper design. https://pbs-limited.co.uk/product/68mm-50mm-reducer-adaptor/ 1 Link to comment Share on other sites More sharing options...
Temp Posted July 28, 2022 Share Posted July 28, 2022 Why such small pipe? I'd worry about blockages due to leaf debris. 1 Link to comment Share on other sites More sharing options...
WWilts Posted July 28, 2022 Author Share Posted July 28, 2022 Increased the pipe size Link to comment Share on other sites More sharing options...
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