Waste pipe size?

[himmerz]

Hello, I am looking to move some waste pipes in my house as I will be relocating a washing machine.

My question is what size waste pipe do I have. I have measured with a gauge and get 56.08mm on the outer diameter.

My understanding was the common sizes are 32, 40 and 50mm,

I am aware there are also some imperial sizes too which I have previously had an issue when trying to buy a reducer before at another house.

Based on this outer diameter what am I likely to have as i am trying to buy a reducer to 40 mm and don't want to cut it till have am able to work on it.

Thanks in advanced.

 

[SimonG]

50mm solvent weld pipe and fittings.

 

[himmerz]

50mm solvent weld pipe and fittings.

Thank you for your reply. So why do they call it 50mm is this the internal measurement instead of external then? So I would just need a 50 to 40 reducer then?

 

[SimonG]

Same as the 40mm not being 40mm. Reducer and a socket to glue it in.