An old water piston or bucket pump, modeled from free a blueprint (included at zipfile).
Some parts should be beveled if rendered at close distance.
If you have a real one to take a look, please improve it with more details
and republish it in this swap community.
There's no textures, though can easily be done aplying stains, dirty, scratches, rust, etc.
You can see more of my artwork and a scene using this pump at:
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