Function: This manual device moves or compresses air to inflate objects.
Mechanism: It operates using a mechanical component, likely a piston or diaphragm, which creates a pressure difference to force air movement.
Operation: The user pulls and pushes the black handle to draw air into the chamber and then expel it through the nozzle. Many such pumps are "double-action," meaning they inflate on both the push and pull strokes, making inflation faster.