Businesses in the pumps and compressors category supply equipment that moves liquids or increases the pressure of gases and air. Products may include centrifugal, diaphragm, submersible and dosing pumps, as well as air, gas and refrigeration compressors. They may also provide related equipment such as motors, controls, pressure vessels, filters, hoses, valves and replacement parts. Customers range from households and farms to factories, construction firms, utilities and commercial premises. Services can include selecting equipment for a particular flow rate, pressure, fluid or operating environment, as well as installation, commissioning, inspection and maintenance. Repair work may involve diagnosing faults, replacing seals, bearings or other components, and overhauling pumps and compressor units.