Riser for square clay gulley

Joined
23 Sep 2010
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United Kingdom
Hi,

Need to raise an existing rain water drain so that I can tee into it. Thought it would be easy but the existing clay gulley has a square hole/neck and the t-pieces are 110mm round.

I had assumed I could buy a ribbed seal (or similar) but can't seem to find one. Am I googling the wrong words or is there another of converting square to round?

Thanks
 
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