turning to fig1 a and 1b , a sprayer is shown generally designated 1 and comprising a sprayer bridge 10 mounted over a sprayer housing 30 in a displaceable manner the bridge 10 further comprises a dispersion element 20 configured for dispersing fluid emitted from the sprayer housing 30 . the housing 30 further comprises an engagement arrangement 40 configured for allowing controlled displacement of the bridge 10 over the housing 30 . the sprayer housing 30 is constituted by a single injection molded body 32 having an inlet end 34 and an opposite outlet end 36 ( shown in fig3 b ) about which is elevated a protecting sleeve 36 ′. the inlet end 34 is configured for fixed attachment to a fluid source ( a tank , a pipe etc .) via an attachment portion 33 having a dedicated thread 31 . the engagement arrangement 40 of the housing 30 comprises two lateral wings 42 which are inwardly depressible with respect to the housing body 32 , each wing 42 comprising a snap - type latch 44 projecting outwardly from the housing body 32 . the wings 42 are arranged diametrically opposite one another , i . e . disposed at 180 ° about a longitudinal axis x of the housing 32 . the engagement arrangement 40 further comprises two longitudinal guides 46 , also diametrically opposed , but angularly spaced 90 ° from the wings 42 . the guides 46 extend the majority of the length of the housing body 32 and are formed , at an end thereof closer to the fluid outlet 36 protected by the sleeve 36 ′, with restricting projections 48 , configured for restricting the movement of the bridge in a non - axial direction ( i . e . limiting circular runout of the bridge ). in addition , it is noted that the housing further comprise two protrusions c configured for reducing the radial degree of freedom of the bridge over the housing , at least when in the open position thereof . specifically , the protrusions c bridge the gap formed between the bridge 10 and the housing 30 . with additional reference being made to fig3 a and 3b , the housing 32 is hollow and accommodates therein an outlet nozzle 39 having an outlet channel 37 . it is appreciated that the diameter of the channel 37 is considerably smaller than the diameter of a channel 35 leading thereto from the fluid inlet 34 , the diameter being defined according to the desired flow - rate through the sprayer 1 . it is observed that there extends an annular basin b about the nozzle 39 , configured for accumulating therein of clogging material ( e . g . dirt , mud etc .). the arrangement is such that the basin floor f is located much lower than the outlet 37 of the nozzle 39 , whereby such accumulated material does not block the nozzle 39 . in addition , it is appreciated that there are two slots 47 extending on both sides of the housing , configured , among other things , for drainage of accumulated material from the basin b . a top - most end of the slots 47 is also located below the level of the nozzle outlet 37 , so that material accumulated in the basin f can be drained from the housing before rising to a level blocking the nozzle 39 . the bridge 10 comprises a hollow mounting portion 12 configured for receiving therein the sprayer housing 32 . the mounting portion 12 is formed with two diametrically opposed windows 13 configured for slidingly receiving therein the snap - type latches 44 of the engagement arrangement 40 and two diametrically opposed slots 17 configured for receiving therein the guides 46 . the bridge 10 comprises a round top structure constituted by two diametrically opposed arms 14 extending from the mounting portion 12 and meeting at a bridge head 18 elevated over the mounting portion 12 . the dispersion element 20 is integrally formed with the bridge head 18 and disposed between it and the mounting portion 12 . it is also observed that each of the arms 14 is formed with two sloping surfaces 16 forming a dividing ridge 16 facing the central axis of the sprayer 1 . in operation , the dividing ridge 16 serves to prevent obstruction of the fluid dispersed by the crown 20 . turning now to fig4 aa and 4b , the sprayer 1 is shown attached to a fluid source b via the attachment portion 33 . it is noted that this attachment is fixed ( i . e . the housing 32 does not displace with respect to the source b at least during operation ). in the position shown in fig4 a , the sprayer 1 is in its closed position , the mounting portion 12 of the bridge 10 being received over a bottom portion of the housing body 32 so that the dispersion element 20 rests on the rim of the protecting sleeve 36 ′, thereby sealing it . it is also noted that in the above position , the top end 13 b of the window 13 is proximal to the latch 44 . in the above position , fluid is not passed between the inlet 34 and the outlet 36 , and the sleeve 36 ′ is sealed , preventing from dirt and insects from passing into the hollow 38 of the housing body 32 ( which may disrupt operation of the sprayer 1 ). turning now to fig4 b , in operation , fluid passed into the inlet 34 and emitted from the nozzle 37 as a fluid jet is emitted from the outlet 36 at sufficient pressure as to elevate the crown 20 over the rim of the sleeve 36 ′. under such pressure , the entire bridge 10 is displaced upwards so that there is formed a gap g between the crown 20 and the sleeve 36 ′. in this position , fluid emitted from the outlet 36 impacts the crown 20 which then disperses the fluid jet by virtue of its geometric shape — teeth 24 arranged about the crown body 22 . it is also noted that fluid is dispersed from the crown 20 in a radially outwards direction , whereby the shape of the arm 14 and in particular the dividing ridge 16 prevent obstruction of the emitted fluid . it is also noted that the sprayer 1 is a directional sprayer which is designed to disperse fluid in only a predetermined sector . specifically in the described example , the crown teeth 24 cover only about 270 ° ( and not the entire 360 ). however , it is appreciated that a plurality of dispersion crowns can be contemplated , each having a different dispersion profile based on specific irrigation requirements . in the open position shown in fig4 , the pressure of the fluid pushes the bridge upwards but its movement is restricted by the latches 44 of the wings 42 . in particular , in the open position , the bottom portion 13 a of the window 13 abuts the latches 44 , which prevent further upward displacement of the bridge 10 . once fluid flow is ceased , the pressure on the crown 20 drops , whereby the entire bridge 10 falls back to its closed position ( shown in fig4 a ), by virtue of gravitational forces . it is noted that in both position , closed and open , shown in fig4 a and 4b , the fluid inlet 34 remains fixed and the distance of the fluid outlet 36 does not vary with respect to the fluid inlet 34 . to the contrary , the mobile part of the sprayer 1 is the bridge 10 and not the fluid outlet 36 . turning now to fig5 a and 5b , another example of a sprayer is shown , generally designated 1 ′. under this design , the sprayer 1 ′ comprises a similar bridge 10 , but a modified housing 30 ′ which is configured for articulation to an additional member 50 and comprising a flow - rate regulator 60 . under this arrangement , the housing 30 ′ comprises the sleeve 36 ″ and the additional member 50 comprises the fluid inlet 54 which is configured for fixed attachment to a fluid source . a bottom portion of the housing 30 ′ is formed with a flow - rate regulator structure 60 configured for accommodating a sealing ring 80 and a diaphragm 70 , for the purpose of regulating fluid flow from the inlet 54 to the outlet 39 ′, as shown in fig6 . the operation of the sprayer 1 ′ is essentially identical to the operation of sprayer 1 , with the difference being in the structure of the housing 30 ′. in particular , in this case as well , the fluid inlet 54 remains in fixed attachment to the source via its connecting portion 53 , and the distance between the fluid inlet 54 and the fluid outlet 39 ′ remains fixed . turning now to fig8 a to 9 , another embodiment of a sprayer is shown , generally designated 101 , and which is similar to the previously described sprayer 1 ′. elements of sprayer 101 similar to those of sprayer 1 ′ are designated by the same reference numbers , upped by a 100 , so that element 132 of sprayer 101 is similar to element 32 ′ of sprayer 1 ′ etc . the sprayer 101 differs from the sprayer 1 ′ by the design of several elements as will be described below . first of all , the nozzle is not in the form of a straight channel ( as nozzle 37 ′), and now comprises three segments : a top straight segment 137 a of a small diameter , a conical / tapering segment 137 b and a bottom straight segment 137 c , thereby defining a tapering shape of the nozzle . using a diverging design of the nozzle can facilitate better emission of fluid from the sprayer and more convenient control over the pressure of the irrigation fluid within the nozzle . secondly , the latch 134 is provided with a projection 135 which is configured for being received within a corresponding nook 115 of the bridge member 110 . engagement between the projection 135 and nook 115 facilitates restricting the spray member 130 from performing a tilting movement about the longitudinal axis of the sprayer 101 . furthermore , with particular reference being made to fig9 , it is noted that one of the guide members 148 of the sprayer is provided with a flat portion 149 configured for providing a more efficient plastic molding process when manufacturing the sprayer . in particular , this flat portion 149 is formed by a piece of the mold allowing more convenient injection of the molten plastic during injection molding . another difference between the sprayer 101 and the sprayer 1 ′ lies in the configuration of the bottom portion 162 of element 160 which is configured for holding the diaphragm in place . under the present design , the bottom portion 162 comprises legs 164 circumferentially spaced about the central axis of the sprayer and configured for retaining therein the diaphragm . those skilled in the art to which this invention pertains will readily appreciate that numerous changes , variations , and modifications can be made without departing from the scope of the invention , mutatis mutandis .