Metal/Plastic conduit

[Pilfo]

Will a 20mm metal (conduit) through box, fit onto 20mm pvc round conduit tube?

No need to thread, just slide the through box over the conduit.

Pilfo

 

[hairyben]

you'll want a male bush (plastic coupler to 20mm thread)

 

[Lectrician]

Known in the wholesaler as "a male conduit adaptor"

 

[333rocky333]

Will a 20mm metal (conduit) through box, fit onto 20mm pvc round conduit tube?

No need to thread, just slide the through box over the conduit.

The outer diameter of 20mm plastic is greater than the internal diameter of the metal box so would not slide over anyway.