De or het doorkoppeling?

The correct Dutch article is:

de doorkoppeling

Rule Words ending in -ing: almost always de. See the rule

How to use doorkoppeling

the doorkoppelingde doorkoppeling
this doorkoppelingdeze doorkoppeling
that doorkoppelingdie doorkoppeling
our doorkoppelingonze doorkoppeling
your doorkoppelingjouw doorkoppeling
every doorkoppelingelke doorkoppeling
which doorkoppeling?welke doorkoppeling?
a big doorkoppeling / the big doorkoppelingeen grote doorkoppeling, de grote doorkoppeling