Are any solvent fittings available?

[SMB]

Hi,
I am at present doing a project (not plumbing).
I need to connect 15mm copper fitting to either 50 or 40mm plastic pipe.
Does anyone know of a solvent adapter available, as I can't find one.
Many thanks.
SMB

 

[ShaunCorbs]

May I ask why ?

 

[DripsnDropsBognor]

50 to 43 to 22 then 15 but won't be able to do it all in solvent I'm pretty sure. And it won't look pretty

 

[SMB]

May I ask why ?

Basically one of these to get the tall weeds in an orchard.
However can't get a waterproof AND secure fitting of the 15mm straight connector into the plastic pipe.