The title says it all - Herko K4013 fuel pump for $25. I find this very dubious. Has anybody heard of this? Is it just a "rebuild kit" and the description is a typo?

 

I'd rate that plausible. A few years ago I bought a $35 pump that was equally dubious fleabay bait. Tested to actually pump fuel and resting in my road spares box behind the back seat right now. Yours shows a lot of plastic but hey, you need a road spare too, right?