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Discuss Extending underfloor waste pipe in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

Hi

I currently have a downstairs toilet that drops into a waste pipe that exits through the wall and into an inspection chamber.

I need to extend the underfloor waste pipe to the next room for a new kitchen. As I am digging up the floor and re-doing the bathroom is like to confirm the best practice for connecting to the underfloor pipe.

Is it okay to leave the pipe in position, use a 87.5 T piece placed with the T vertical, drop the toilet into this and carry through to the kitchen.

Or is it better to drop from the toilet to a swept bend, and connect to a 45 degree Y connector placed horizontally? With the other leg carrying through to the kitchen

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