Pump accessories are all those additional components that expand the functionality of a pump, or make it more complete. They can be non-return valves, inverters, flow switches, pressure switches, expansion vessels, longer or larger diameter suction or discharge pipes, floats, devices to control pumps from the Internet.
All pump functions can be expanded, whether by fitting a longer discharge pipe, adding an expansion tank, installing an inverter or making a pump “smart”. It depends on your needs and on the type of pump (submerged, submersible, surface, circulation...).