Businesses in the compressors category supply equipment that raises the pressure of air or other gases for use in industrial, commercial and domestic settings. Products may include portable and fixed air compressors, screw and piston compressors, oil-free models, vacuum pumps and related equipment such as air receivers, dryers, filters, hoses and control systems. Some suppliers also provide compressors for refrigeration, vehicle workshops, construction, manufacturing and specialist process applications. Services commonly include helping customers select equipment to suit the required pressure, airflow and duty, as well as delivery, installation and commissioning. Businesses may offer short- or long-term compressor hire, routine servicing, fault diagnosis and repairs, replacement parts and planned maintenance. Work can cover checks for leaks, performance and safety, and the upkeep of associated compressed-air systems.