elongated slots 39 may be formed at the inner sides of support legs 36 for receiving each projection 38 end walls of the slots being matched to and engaging projections 38 for limiting the outward extent of element 21 to its fig7 position element 21 may extend outwardly of one or more side walls 33 of the nozzle as at 41 so as to provide gripping means for facilitating manual sliding movement of the element and in the embodiment of fig6 and 7 element 21 is in the form of a baffle plate having an open port 42 therein coaxial with the discharge orifice and of a size greater than that of orifice 35 as in accordance with my prior application u s ser no 694 101 or in accordance with the aforementioned application ser no 884 437 the nozzle is rotatable about its central axis into the off position of fig2 in which discharge through the orifice is closed rotation of the nozzle through 360 u00b0 in either direction in 90 u00b0 increments closes off or selects the discharge rotation of the nozzle through 90 u00b0 from the off position in one direction as in fig3 facilitates discharge of product during pumping such as a stream and rotation of the.