rides in slot central section 61 as the fitting 12 is swiveled in any direction from the fig7 position tab 40 rides in the first and third slot sections 58 and 61 and fitting rotation is limited by adjacent walls 52 and 54 when swung in any direction from the fitting position illustrated in fig8 tab 40 moves into the lower and third slot sections 60 where the other ends of the same wall 52 and 54 prevent or limit rotation of the fitting 12 about its own axis fig9 to 16 illustrate the manner in which the enlarged slot section 61 permits 120 degree rotation of the fitting 12 when in the positions illustrated in fig7 and 8 as noted above when in the fig7 position the fitting 12 may be swung to any position left right and down but the fitting portion 14 must be generally horizontal or pointed downwardly and from the fig8 position the fitting may be swung right left or up from the position shown it is the central section 61 of the slot that divides movement of the fitting portion 14 into these two ranges one generally above a horizontal plane extending through ball 24 and one generally below this horizontal plane in fig9 to 12 the fitting 12 is illustrated in dotted lines and depicted in the same position illustrated in fig7 where rotational movement of the fitting 12 about its own axis is permitted note that in this position axis.