The present invention refers to an interchangeable device comprising: a high-pressure pump unit (16002), a water intake (16003), and a lance (16005), characterized by a coupling system comprising: a shaped shaft (16001)-shaped hub (16007) coupling, an anti-rotation positioning element (16008), and a locking clamp (16009), wherein the coupling system allows a power generator of varying type (16006) to be coupled, rendering the device a high-pressure washer and/or a high-pressure sprayer.

A pumping device for liquids is described which comprises a tank for liquids, from which a feeding pipe of a pump with a solar panel draws. The tank consists of a supporting frame with tubular uprights and upper and lower horizontal connection lengths, which supports and surrounds a flexible bag for containing liquids and has an upper connection crossbar of the upper horizontal lengths of the supporting frame, on which the pump with solar panel is mounted. The bag has a lower filling hole or mouth, in which the feeding pipe can be inserted and an overflow hole made in the upper of part of its side wall in position lower than said mouth.

A plant watering container that includes a container body, a liquid pump system and an extendable and retractable dispensing arm system.