Esprit injectors work by hydraulic injection, just like the brake system on your vehicle.  It is the most efficient way to move a liquid under pressure.  Pumps or syringes with hoses or compressors are not only big and bulky, they simply do not work as well.

The pressure and vacuum cycles are both produced with the seal and the plunger.  Our injectors are plastic with brass threads for longevity, and require no chemicals to clean.  The seal are replaced after 15-20 repairs.