Handheld concrete floor grinder/polisher (also called a 3-head concrete grinding machine).
The three gold-colored rotating discs are diamond grinding wheels. They are used to:
Grind and level concrete floors
Remove old paint, epoxy, glue, or coatings
Smooth rough concrete surfaces
Prepare floors before applying epoxy or other finishes
The machine is held by hand and moved across the surface while the three heads rotate to grind the material evenly.
So, this is not a pump—it is a portable concrete grinder used in construction and flooring work