Manufacturing process of a flexible spiraled hose suitable for delivering a fluid; said flexible spiral hose comprising a central conduit, a lateral wall having an internal side and an external side, a first thread-like element that is wound along a spiral trajectory in the lateral wall near said internal side and a second thread-like element that is wound along a spiral trajectory in the lateral wall near said external side; said process comprising the following steps: - extruding a first shaped piece with substantially "T"-shaped section, provided with a main base wing and a secondary central wing; said shaped piece comprising a soft material and comprising the first thread-like element in said secondary central wing; - extruding a second shaped piece with substantially "T"-shaped section, provided with a main base wing and a secondary central wing; said section comprising a soft material and comprising the second thread-like element in said secondary central wing; - disposing said first shaped piece in a winding device, putting the main wing of the first shaped piece in contact with the winding device and placing the secondary central wing outwards; - rotating said winding device, winding said first shaped piece on said winding device along a spiraled trajectory, putting the main wings of the adjacent turns of the first shaped piece in mutual contact; - disposed said second shaped piece on the winding device, disposing the second shaped piece in overturned position relative to the first shaped piece and positioning the secondary central wing of the second shaped piece in such a way to face the first shaped piece, and the main base wing of the second shaped piece being disposed in such a way to face the exterior of the winding device, in preferably parallel direction relative to the main base wing of the first shaped piece. said flexible spiral hose comprising a central conduit, a lateral wall having an internal side and an external side, a first thread-like element that is wound along a spiral trajectory in the lateral wall near said internal side and a second thread-like element that is wound along a spiral trajectory in the lateral wall near said external side; said process comprising the following steps: - extruding a first shaped piece with substantially "T"-shaped section, provided with a main base wing and a secondary central wing; said shaped piece comprising a soft material and comprising the first thread-like element in said secondary central wing; - extruding a second shaped piece with substantially "T"-shaped section, provided with a main base wing and a secondary central wing; said section comprising a soft material and comprising the second thread-like element in said secondary central wing; - disposing said first shaped piece in a winding device, putting the main wing of the first shaped piece in contact with the winding device and placing the secondary central wing outwards; - rotating said winding device, winding said first shaped piece on said winding device along a spiraled trajectory, putting the main wings of the adjacent turns of the first shaped piece in mutual contact; - disposed said second shaped piece on the winding device, disposing the second shaped piece in overturned position relative to the first shaped piece and positioning the secondary central wing of the second shaped piece in such a way to face the first shaped piece, and the main base wing of the second shaped piece being disposed in such a way to face the exterior of the winding device, in preferably parallel direction relative to the main base wing of the first shaped piece. - extruding a first shaped piece with substantially "T"-shaped section, provided with a main base wing and a secondary central wing; said shaped piece comprising a soft material and comprising the first thread-like element in said secondary central wing; - extruding a second shaped piece with substantially "T"-shaped section, provided with a main base wing and a secondary central wing; said section comprising a soft material and comprising the second thread-like element in said secondary central wing; - disposing said first shaped piece in a winding device, putting the main wing of the first shaped piece in contact with the winding device and placing the secondary central wing outwards; - rotating said winding device, winding said first shaped piece on said winding device along a spiraled trajectory, putting the main wings of the adjacent turns of the first shaped piece in mutual contact; - disposed said second shaped piece on the winding device, disposing the second shaped piece in overturned position relative to the first shaped piece and positioning the secondary central wing of the second shaped piece in such a way to face the first shaped piece, and the main base wing of the second shaped piece being disposed in such a way to face the exterior of the winding device, in preferably parallel direction relative to the main base wing of the first shaped piece.