Can anyone identify this part?

[Birdie]

I'm trying to identify the scope part from 'The Lassiter' from the Firefly episode Trash.

My first thought was that it was some kind of syringe, but haven't found anything to match.

It looks like it has some kind of thick rubber washer at the rear, and in the bottom pic, it seems to have 'vents' at the front. If anyone has any thoughts I'd appreciate it

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[SurferGeek]

It looks like some type of roller? Rolltop desk, garage door, ???

 

[mandybat]

maybe some kind of desoldering pump? there are loads of different designs and they are cheap and readily available