De or het dekselopening?

The correct Dutch article is:

de dekselopening

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

This word is not in the word lists we use to double-check answers.

How to use dekselopening

the dekselopeningde dekselopening
this dekselopeningdeze dekselopening
that dekselopeningdie dekselopening
our dekselopeningonze dekselopening
your dekselopeningjouw dekselopening
every dekselopeningelke dekselopening
which dekselopening?welke dekselopening?
a big dekselopening / the big dekselopeningeen grote dekselopening, de grote dekselopening