ST57-41217-PushPull.3dm (8.8 MB)
Another imported 3DStep file from McMaster Carr won’t behave as expected. 
It pushes 26 inches, but the change doesn’t actually take place?
ST57-41217-PushPull.3dm (8.8 MB)
Don’t mess around with PushPull on imported geometry, or any geometry of any complexity. Pushpull is a gimmick to appeal to Sketchup users to make boring houses. There’s a whole world of Rhino tools out there that has nothing to do with this PushPull nonsense, you’re not going to actually master Rhino until you move beyond it.
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The dark pipe seems to be an exploded object, meaning it’s a composition of individual surfaces.
Not only that, but there’s a shorter pipe overlapping the longer one exactly. Now I’m not working in “freedom units”, but it’s exactly 26 inches long, which means that you performed an extrude or pull on the cap surface of the pipe. If you want to shorten it by a certain amount, you can Join all relevant surfaces into a polysurface (i.e. solid), simply select the cap surface (i.e. CMD + SHIFT + left mouse button), and move it by 26".
This is not an issue with PushPull, but rather a misunderstanding. If you want to modify a geometry as a whole, it should be a solid. If you want to work on it’s individual surfaces, you can explode it, but each surfaces needs to be treated individually now.
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