connect marley pipe to standard 15/22 copper pipe

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Hi, I plan to rerun some pipework in my bathroom. Currently the cold water is from the blue plastic Marley pipe as shown in the pictures.
I am wondering what kind of fittings I should use to connect the Marley pipe to standard 15 or 22 copper pipe. It looks the size of the Marley pipe is slightly bigger than 15 or 22 mm. Will the normal 15/22 pushing coupling/Elow do the job? Thanks in advance.

 

[lame plumber]

probably talking about 20/25mm mdpe and fittings are available to convert to cu, dont forget to use an mdpe insert as well

JG Speedfit UG601B MDPE Copper Adaptor 20 x 15mm | NoLinkingToThis

 

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Thanks. I attached some photos of the pipe. I may measure the perimeter with a stip later.
There are signs of 'marley 3/4' on a elbow and 'marley 3/4 X 1/2' on a Tee.

 

[lame plumber]

forget my last, just dont touch any of that unless your going to rip it out and replace. It can become very fragile over time, so a crack and youll be crying.

 

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Thanks for the reminder. The pipe still looks strong. and I will not do the job on christmas day.
The perimeter of mainwater pipe is 76mm as i measured. Its diamter should be 23.8 mm if my calculation is right. However the label on the tee is '3/4 X 1/2'. does it suggest the diameters of the main water pipe and the samll pipe through the wall to a basin are 19 mm and 13 mm respectively?
I am quite confused what size of adapter I should use to connect the mainwater pipe and a 15/22 mm copper pipe.

 

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I contacted Marley and got advice to use the OCA21 Marley overflow adaptor which can be solvent welded to the 23 mm cold water pipe on one end and on other end to [FONT=&quot]copper pipe via push-fitting or [FONT=&quot]traditional 22mm compression fitting.
I was wondering whether I could use other universal 21.5 mm overflow adaptor. The delivery charge for OCA21 adaptor is more than 10 pounds, a bit higher for me honestly.
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[Jasper]

Have a look at philmac universal transition couplings.

 

[Jasper]

Have a look at a philmac universal transition coupling.