Abstract: The invention relates to a hydraulic rotating joint (100) without gaskets between a fixed part and a movable part of a collector group, comprising a fixed part or stator (1), integral with the fixed part of the collector group, and a movable part or rotor (2), integral with the movable part of the collector group, said stator (1) being provided with an inlet (21) and with an outlet (22) of at least one fluid from and toward a conditioning system provided on said fixed part of the collector group, said rotor (2) being provided qithin a cavity comprised by said stator (1), said rotor being comprised of two rotating arms, submerged within the liquid in said stator (1), said arms respectively comprising the suction tube and discharge tube of liquid to be transferred between the two parts of the collector group, said rotor (2) being provided with means for circulating said liquid between the two parts of the collector group.