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Cheers, they are plastic pipes. If anyone else can confirm if they need to be sleeved or not that would be helpful.
Toupret filler sounds like the answer. Deep-ish hole (half brick depth), want to avoid expanding foam. Is there a specific Toupret for deeper fills? (Edit: this? https://www.screwfix.com/p/toupret-quick-dry-filler-2kg/763pp)
Cupcakes
What are the pipes made from?
Double check, but I thought plastic pipes were aok for any concrete or plaster. It's cooper that's the issue. Copper you can use duct tape. Then depending on the hole either expanding foam and Toupret interior filler, or just Torpret.
I know you said premixed, but it's litterally just mixing some powder and water together.