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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@nankatsu
Something like this?
Presumably you need holes to allow the grey pipe to run off?
And cut a hole for the black one
https://www.toolstation.com/160mm-x-160mm-square-gully-grid/p70749?store=GE&utm_source=googleshopping&utm_medium=feed&utm_campaign=googleshoppingfeed&mkwid=_dc&pcrid=558023894541&pkw=&pmt=&gclid=EAIaIQobChMI15SOn6bk9wIVDs13Ch2eTAAUEAQYBSABEgK-TvD_BwE&gclsrc=aw.ds