the water carrier 10 when the shaft 16 is within socket 20 but permits removal of the water carrier 10 and socket 20 from the shaft 16 by pulling water carrier 10 away from motor 14 along axis 12 an axle 22 extends along axis 12 outward from the other end of the water carrier 10 to support the water carrier 10 with shaft 16 when the water carrier 10 is rotated by the motor 14 axle 22 includes a circumferential groove 24 which may fit within a corresponding groove in a support strut 52 shown in fig2 the strut 52 is a thin bar having in its upper edge a semi circular notch 54 into which fits the groove 24 of the axle 22 so as to prevent motion of the water carrier 10 along axis 12 when the groove 24 and notch 54 of the strut 52 are so engaged nevertheless axle 22 may be lifted from the notch 54 in the support strut 52 so that the water carrier 10 may be moved in the axial direction 12 to release shaft 16 of the motor from the socket 20 so that the entire water carrier 10 may be easily removed for cleaning the end of the water carrier 10 having the socket 20 provides a circular base 26 in which the socket 20 is centered and axially extending walls 28 providing an air cushion 31 enclosing a cylindrical air cushion volume 30 the circular edge of the walls 28 of the air cushion 31 removed from the base 26 are attached to the outer edge of a first.