7. IN COMBINATION, (A) A SUPPORT, INCLUDING A HOLLOW STATIONARY PEDESTAL, (B) A DERRICK MOUNTED ON SAID PEDESTAL FOR ROTARY MOVEMENT ABOUT A GENERALLY VERTICAL AXIS PASSING THROUGH THE VERTICAL AXIS OF SAID PEDESTAL, SAID DERRICK BEING ADAPTED TO MOUNT A PLURALITY OF FLUID POWERED MOTOR UNITS THEREON, AND (C) COMPACT FLUID TRANSMITTING MEANS DISPOSED INTERIORLY OF SAID PEDESTAL FOR TRANSFERRING OPERATING FLUID FROM THE SUPPORT TO THE DERRICK AND VICE VERSA FOR USE IN THE MOTOR UNITS ON THE DERRICK, SAID FLUID TRANSMITTING MEANS COMMPRISING, (1) A SLEEVE-LIKE HOUSING MEMBER HAVING TOP AND BOTTOM SURFACES AND AN INTERIOR CYLINDRICAL-LIKE SIDE SURFACE, (2) FLUID DISTRIBUTING PORTS IN SAID HOUSING MEMBER, COMMUNICATING WITH SAID INTERIOR SURFACE AND OPENING GENERALLY VERTICALLY ONTO SAID HOUSING MEMBER, (3) A RING-LIKE MEMBER SUPPORTED IN SAID HOUSING MEMBER AND HAVING TOP AND BOTTOM SURFACES, AND AN EXTERIOR SURFACE DISPOSED IN CONFRONTING RELATION TO SAID INTERIOR SURFACE, SAID RING-LIKE MEMBER BEING MOVABLY DISPOSED IN SAID HOUSING MEMBER FOR RELATIVE ROTATIONAL MOVEMENT THEREBETWEEN, (4) FLUID DISTRIBUTING PORTS IN SAID RING-LIKE MEMBER COMMUNICATING WITH SAID EXTERIOR SURFACE AND OPENING GENERALLY VERTICALLY ONTO SAID RINGLIKE MEMBER IN A DIRECTION OPPOSITE TO THE DIRECTION OF OPENING OF THE FIRST MENTIONED PORTS. (5) MEANS INCLUDING ENDLESS CIRCUMFERENTIALLY EXTENDING, AXIALLY SPACED GROOVES ON THE SIDE SURFACE OF AT LEAST ONE OF SAID MEMBERS COMMUNICATING EACH OF SAID PORTS IN SAID HOUSING MEMBER WITH A RESPECTIVE ONE OF SAID PORTS IN SAID RING-LIKE MEMBER IRRESPECTIVE OF THE RELATIVE ROTATIONAL POSITIONS OF SAID MEMBERS, (D) MEANS ATTACHING ONE OF SAID MEMBERS TO SAID SUPPORT, AND (E) MEANS ATTACHING THE OTHER OF SAID MEMBERS TO SAID DERRICK FOR ROTATION THEREWITH.