Clearing the moisture trap

I think I figured out how to clear the moisture trap on my compressor; press the little button-thing on the bottom with the compressor running and somehow it will clear out the water, but is that correct? If anyone knows how to get rid of the moisture for sure, please let me know.

That is, indeed, the way it is done.

Ah, thanks. And yeay me for figuring it out myself. [8D]