Got this installed, primed and running at my off grid hunting camp. It is a solid unit, installed directly on 1.25 threaded sand point pipe and has a lot more pumping leverage than a short handle pitcher pump. It effectively moves water from a 12' fine mesh sand point in a tight formation. There's significant hydrostatic pressure to overcome and this pump does it. Now the negative. Had to order twice, both orders were missing a major part. How does this happen? There are 4 total parts!!! Amazon handled the issue, and I was able to make a complete unit from the 2 shipments. The interior is rough, I may try the cylinder hone mentioned in another post if it doesn't wear in. Good unit if yours comes complete. Just be sure to inspect before packing it in to a remote location! Edit after a year's operation. Water scale filled in the rough spots nicely, smooth as silk now. Still pumping and holding up well. This thing holds prime forever. Added a deprime valve below the washers for cold season use to allow the stand pipe to drain.
Kimysue Johnson 
Fred 
