Apparatus for extending and retracting a flexible and extensible hose, comprising: - a first flexible and extensible tubular hose extending in an axial direction (X-X) between a front end and an opposite rear end, said first tubular hose being suitable to be extended to go from an axially withdrawn configuration to an axially extended configuration, and being suitable to be retracted to go from said axially extended configuration to said axially withdrawn configuration; - a support structure defining a housing to contain said first tubular hose in said axially withdrawn configuration; - said support structure comprises an extraction head from which said first tubular hose projects with an axial section when said first tubular hose is in said extended configuration; - support and guide means associated with said extraction head to support and guide the extending or retracting movement of said first tubular hose into or from said support structure; - actuation means associated with said support structure to act driving on said first tubular hose and cause the extending or retracting movement of said first tubular hose and - motor means to actuate said actuation means; - said support and guide means comprise a plurality of guide blocks arranged circumferentially spaced around said first tubular hose to support said first tubular hose during the extending or retracting movement from or towards said support structure, - said extraction head comprises a plurality of actuation points arranged circumferentially spaced around said first hose, - said actuation means comprise a plurality of drive belts arranged at said actuation points to act to axially drive from the outside on said first tubular hose, - said motor means for actuating said actuation means comprise a respective electric motor at each of said actuation points, wherein the driving belt, or the driving belts, of a specific actuation point are actuated by the respective electric motor only, the transmission belts of an actuation point not being kinematically connected by mechanical transmission means to the transmission belts of another actuation point of said plurality of actuation points, characterized in that: - in at least one of said actuation points of the extraction head, the respective drive belts and the respective motor means are mounted to a slide that is movable relative to a slide guide integral with the extraction head and extending in a substantially radial direction with respect to the axis of said first flexible tubular hose, for position adjustment of the drive belts and the motor means of at least one of said actuation points of the extraction head with respect to said first flexible tubular hose and - removable fastener means are operative between the slide and the slide guide to reversibly lock said slide relative to its respective slide guide in the desired position. - a first flexible and extensible tubular hose extending in an axial direction (X-X) between a front end and an opposite rear end, said first tubular hose being suitable to be extended to go from an axially withdrawn configuration to an axially extended configuration, and being suitable to be retracted to go from said axially extended configuration to said axially withdrawn configuration; - a support structure defining a housing to contain said first tubular hose in said axially withdrawn configuration; - said support structure comprises an extraction head from which said first tubular hose projects with an axial section when said first tubular hose is in said extended configuration; - support and guide means associated with said extraction head to support and guide the extending or retracting movement of said first tubular hose into or from said support structure; - actuation means associated with said support structure to act driving on said first tubular hose and cause the extending or retracting movement of said first tubular hose and - motor means to actuate said actuation means; - said support and guide means comprise a plurality of guide blocks arranged circumferentially spaced around said first tubular hose to support said first tubular hose during the extending or retracting movement from or towards said support structure, - said extraction head comprises a plurality of actuation points arranged circumferentially spaced around said first hose, - said actuation means comprise a plurality of drive belts arranged at said actuation points to act to axially drive from the outside on said first tubular hose, - said motor means for actuating said actuation means comprise a respective electric motor at each of said actuation points, wherein the driving belt, or the driving belts, of a specific actuation point are actuated by the respective electric motor only, the transmission belts of an actuation point not being kinematically connected by mechanical transmission means to the transmission belts of another actuation point of said plurality of actuation points, characterized in that: - in at least one of said actuation points of the extraction head, the respective drive belts and the respective motor means are mounted to a slide that is movable relative to a slide guide integral with the extraction head and extending in a substantially radial direction with respect to the axis of said first flexible tubular hose, for position adjustment of the drive belts and the motor means of at least one of said actuation points of the extraction head with respect to said first flexible tubular hose and - removable fastener means are operative between the slide and the slide guide to reversibly lock said slide relative to its respective slide guide in the desired position.