How does the oil filler bottle attach to the crankcase??

Hi Guys. 2005 Grand Scenic 1.9Dci. The bottom part of the oil filler bottle seems to just 'sit' in the crankcase. This can't be right. How is it meant to be please? The black plastic bit is bolted to the stainless steel part (a flange with a 1" neck) underneath and I can just lift it all out in one piece. I assume this isn't right.



Maybe the steel part is meant to be pressed in? I know this isn't the cause of my problems, but it would be nice to know that it can't just let water and crap directly into the crank!?



Am I missing a part??



Thanks



Paul