Can you have a look please?

[Ralphthemouth]

Had some spare time today and was just wondering if anyone could explain the photos. Firstly, the loose vacuum nipple on the tandem pump. Is it normal? And WHY does it always get oily? Secondly what's the empy metal 'cage' thingy for?

 

[QuattroCalum]

Loose vacuum nipple on the tandem pump is normal BUT it shouldn't leak though. I think there's a drilling on the tandem pump (a breather hole) they're pretty much all like that.