50mm to 40mm waste pipe reducer

I have some grey plastic solvent waste pipe, its outside dimension is 51mm.

It disappears off into the kitchen behind some units and then goes outside…

I want to replace it with some 40mm push fit pipe. I plan to do it stages - the kitchen / outside section can wait a few months.

The push fit pipe has an outside dimension of 41mm.

How so I join the 2 bits together??
 
I have some grey plastic solvent waste pipe, its outside dimension is 51mm.

It disappears off into the kitchen behind some units and then goes outside…

I want to replace it with some 40mm push fit pipe. I plan to do it stages - the kitchen / outside section can wait a few months.

The push fit pipe has an outside dimension of 41mm.

How so I join the 2 bits together??

You’ll need a 50 to 40 compression fitting. Google should find you one.
 
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