The air flow was strong, and the stroke frequency changed as I adjusted the speed control. There are minor cosmetic issues, as you can see in the photos. The tubing currently attached to the pump seems okay, but it is covered with a sticky substance. What you see is what you get.
The item "GRS Gravermeister Model GF500 Pump Only" is in sale since Sunday, July 30, 2017. This item is in the category "Jewelry & Watches\Jewelry Design & Repair\Jewelry Tools\Engraving Tools". The seller is "feec" and is located in Bangor, Pennsylvania. This item can be shipped to United States.