So, I was checking my oil this morning and noticed the pipe circled in the picture below had a gap around it. Summoning all my technical knowledge I figured pipe + gap = not good. After investigation, it turns out the cover on the plastic box thing to its right was just balanced on and not clipped on. I've now put all 3 clips back on properly and it feels tight... but can anyone tell me what the box it goes into is (I've left the lid off in the photo)? And possibly what its for? Thanks.