Manufacturers & suppliers of Piston Displacement Air Compressors If you are looking for the highest quality inmanufacture, service and repair of Pressure Washers or Compressors. Whatever your location, we can provide the solutions. Sellarc W. Bateman & Co are manufacturers and suppliers of piston displacement air compressors for any application requiring compressed air such as garages, workshops, and mobile vehicle workshops. A full range of spare parts and consumables are always available. We also specialise in a full range of High Pressure Washers for agriculture, food processing, abattoirs, transport companies and many other applications.