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A sprayer for spraying a fluid can include a sprayer body, a fluid reservoir, a trigger assembly, a flow adjustment mechanism and an air horn assembly. The sprayer body can include a nozzle assembly that defines a fluid outlet and includes a needle arranged within a fluid conduit. The fluid reservoi

A sprayer for spraying a fluid can include a sprayer body, a fluid reservoir, a trigger assembly, a flow adjustment mechanism and an air horn assembly. The sprayer body can include a nozzle assembly that defines a fluid outlet and includes a needle arranged within a fluid conduit. The fluid reservoir can be coupled to the sprayer body and be in communication with the fluid outlet and fluid conduit. The trigger assembly can be coupled to the nozzle assembly and be configured to move the needle as the trigger assembly is depressed. The flow adjustment mechanism can be configured to adjust a flow rate of the sprayer. The air horn can include at least one air horn projection that limits rotation of the air horn between a first position corresponding to a vertical spray pattern and a second position corresponding to a horizontal spray pattern.

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1. A sprayer for spraying a fluid comprising: a sprayer body including a handle portion and a nozzle portion, the nozzle portion including a nozzle assembly that defines a fluid outlet, the nozzle assembly including a fluid conduit and a needle arranged within the fluid conduit, the needle being mov

1. A sprayer for spraying a fluid comprising: a sprayer body including a handle portion and a nozzle portion, the nozzle portion including a nozzle assembly that defines a fluid outlet, the nozzle assembly including a fluid conduit and a needle arranged within the fluid conduit, the needle being movable to a plurality of positions between a closed position and a fully opened position, the needle closing the fluid outlet in the closed position and fully opening the fluid outlet in the fully opened position;a fluid reservoir coupled to the sprayer body and in communication with the fluid outlet and fluid conduit;a trigger assembly coupled to the nozzle assembly and configured to move the needle as the trigger assembly is depressed;a flow adjustment mechanism coupled to the trigger assembly and configured to adjust a flow rate of the sprayer by limiting movement of the trigger assembly and the needle; andan air horn assembly including a collar, which is removably coupled to the nozzle portion, an air diffuser that is arranged axially between the collar and the nozzle portion, and a rotatable air horn that is arranged axially between the collar and the nozzle portion, the collar limiting movement of the air horn and the air diffuser away from the nozzle portion but permitting rotation of the air horn relative to the nozzle portion and the collar without loosening the collar from the nozzle portion, wherein the air horn includes at least one air horn projection that limits rotation of the air horn between a first position corresponding to a vertical spray pattern and a second position corresponding to a horizontal spray pattern. 2. The sprayer of claim 1, wherein the air diffuser includes at least one stop surface that interacts with the at least one air horn projection to limit rotation of the air horn. 3. A sprayer for spraying a fluid comprising: a sprayer body including a handle portion and a nozzle portion, the nozzle portion including a nozzle assembly that defines a fluid outlet, the nozzle assembly including a fluid conduit and a needle arranged within the fluid conduit, the needle being movable to a plurality of positions between a closed position and a fully opened position, the needle closing the fluid outlet in the closed position and fully opening the fluid outlet in the fully opened position;a fluid reservoir coupled to the sprayer body and in communication with the fluid outlet and fluid conduit;a trigger assembly coupled to the nozzle assembly and configured to move the needle as the trigger assembly is depressed;a flow adjustment mechanism coupled to the trigger assembly and configured to adjust a flow rate of the sprayer by limiting movement of the trigger assembly and the needle; andan air horn assembly including a collar, which is removably coupled to the nozzle portion, and a rotatable air horn that is arranged between the collar and the nozzle portion, the air horn assembly configured to permit rotation of the air horn relative to the nozzle portion to a plurality of positions, wherein the air horn includes at least one air horn projection that limits rotation of the air horn between a first position corresponding to a vertical spray pattern and a second position corresponding to a horizontal spray pattern;wherein the air horn assembly further comprises an air diffuser that is arranged between the collar and the nozzle portion, the collar limiting movement of the air diffuser away from the nozzle portion, the air diffuser including at least one stop surface that interacts with the at least one air horn projection to limit rotation of the air horn; andwherein the air horn and the air diffuser include a detent mechanism that inhibits rotation of the air horn from a third position. 4. The sprayer of claim 3, wherein the detent mechanism comprises a notch defined by the air diffuser and a protrusion on the air horn. 5. The sprayer of claim 3, wherein the nozzle portion includes a ridge member that acts as a mechanical stop for the collar. 6. The sprayer of claim 5, wherein the ridge member and collar are configured to permit rotation of the air horn without loosening the collar from a fully tightened position in which the collar is in contact with the ridge member. 7. The sprayer of claim 6, wherein the collar is threadably coupled to the nozzle portion. 8. The sprayer of claim 2, wherein the nozzle portion includes a ridge member that acts as a mechanical stop for the collar. 9. The sprayer of claim 8, wherein the ridge member and collar are configured to permit rotation of the air horn without loosening the collar from a fully tightened position in which the collar is in contact with the ridge member. 10. A sprayer for spraying a fluid comprising: a sprayer body including a handle portion and a nozzle portion, the nozzle portion including a nozzle assembly that defines a fluid outlet, the nozzle assembly including a fluid conduit and a needle arranged within the fluid conduit, the needle being movable to a plurality of positions between a closed position and a fully opened position, the needle closing the fluid outlet in the closed position and fully opening the fluid outlet in the fully opened position;a fluid reservoir coupled to the sprayer body and in communication with the fluid outlet and fluid conduit;a trigger assembly coupled to the nozzle assembly and configured to move the needle as the trigger assembly is depressed;a flow adjustment mechanism coupled to the trigger assembly and configured to adjust a flow rate of the sprayer by limiting movement of the trigger assembly and the needle; andan air horn assembly including a collar, which is threadably coupled to the nozzle portion, an air diffuser that is arranged axially between the collar and the nozzle portion, and a rotatable air horn that is arranged axially between the collar and nozzle portion, the collar limiting movement of the air horn and the air diffuser away from the nozzle portion, wherein the nozzle portion includes a ridge member that acts as a mechanical stop for the collar and wherein the ridge member and collar are configured to permit rotation of the air horn relative to the nozzle portion and the collar without loosening the collar from a fully tightened position in which the collar is in contact with the ridge member. 11. The sprayer of claim 10, wherein the air horn and air diffuser include a first detent mechanism that inhibits rotation of the air horn from a first position. 12. The sprayer of claim 11, wherein the first detent mechanism comprises a notch defined by the air diffuser and a protrusion on the air horn. 13. A sprayer for spraying a fluid comprising: a sprayer body including a handle portion and a nozzle portion, the nozzle portion including a nozzle assembly that defines a fluid outlet, the nozzle assembly including a fluid conduit and a needle arranged within the fluid conduit, the needle being movable to a plurality of positions between a closed position and a fully opened position, the needle closing the fluid outlet in the closed position and fully opening the fluid outlet in the fully opened position;a fluid reservoir coupled to the sprayer body and in communication with the fluid outlet and fluid conduit;a trigger assembly coupled to the nozzle assembly and configured to move the needle as the trigger assembly is depressed;a flow adjustment mechanism coupled to the trigger assembly and configured to adjust a flow rate of the sprayer by limiting movement of the trigger assembly and the needle; andan air horn assembly including a collar, which is removably coupled to the nozzle portion, and a rotatable air horn that is arranged between the collar and nozzle portion, the air horn assembly configured to permit rotation of the air horn to a plurality of positions, wherein the nozzle portion includes a ridge member that acts as a mechanical stop for the collar and wherein the ridge member and collar are configured to permit rotation of the air horn without loosening the collar from a fully tightened position in which the collar is in contact with the ridge member;wherein the air horn assembly further comprises an air diffuser that is arranged between the collar and the nozzle portion, the collar limiting movement of the air diffuser away from the nozzle portion, the air horn and air diffuser including a first detent mechanism that inhibits rotation of the air horn from a first position; andwherein the air horn and air diffuser include a second detent mechanism that inhibits rotation of the air horn from a second position and a third detent mechanism that inhibits rotation of the air horn from a third position. 14. The sprayer of claim 13, wherein the first position corresponds to a vertical spray pattern, the second position corresponds to a horizontal spray pattern and the third position corresponds to an angled spray pattern. 15. The sprayer of claim 14, wherein the angled spray pattern corresponds to an angle of 45 degrees. 16. The sprayer of claim 15, wherein the collar is threadably coupled to the nozzle portion. 17. The sprayer of claim 13, wherein each of the first, second and third detent mechanisms comprises a notch defined by the air diffuser and a protrusion on the air horn. 18. A sprayer for spraying a fluid comprising: a sprayer body including a handle portion and a nozzle portion, the nozzle portion including a nozzle assembly that defines a fluid outlet, the nozzle assembly including a fluid conduit and a needle arranged within the fluid conduit, the needle being movable to a plurality of positions between a closed position and a fully opened position, the needle closing the fluid outlet in the closed position and fully opening the fluid outlet in the fully opened position;a fluid reservoir coupled to the sprayer body and in communication with the fluid outlet and fluid conduit;a trigger assembly coupled to the nozzle assembly and configured to move the needle as the trigger assembly is depressed;a flow adjustment mechanism coupled to the trigger assembly and configured to adjust a flow rate of the sprayer; andan air horn assembly including a collar removably coupled to the nozzle portion, an air diffuser that is arranged axially between the collar and the nozzle portion, the collar limiting movement of the air diffuser away from the nozzle portion, and a rotatable air horn arranged axially between the collar and air diffuser, the air horn assembly configured to permit rotation of the air horn relative to the nozzle portion and the collar to a plurality of positions, wherein:(i) the nozzle portion includes a ridge member that acts as a mechanical stop for the collar,(ii) the ridge member and collar are configured to permit rotation of the air horn without loosening the collar from a fully tightened position in which the collar is in contact with the ridge member,(iii) the air horn includes at least one air horn projection, and(iv) the air diffuser includes at least one stop surface that interacts with the at least one air horn projection to limit rotation of the air horn between a first position corresponding to a vertical spray pattern and a second position corresponding to a horizontal spray pattern. 19. The sprayer of claim 18, wherein the air horn and air diffuser include a detent mechanism that inhibits rotation of the air horn from a third position. 20. The sprayer of claim 18, wherein the collar is threadably coupled to the nozzle portion. 21. The sprayer of claim 2, wherein the air horn and the air diffuser include a detent mechanism that inhibits rotation of the air horn from a third position. 22. The sprayer of claim 21, wherein the detent mechanism comprises a notch defined by the air diffuser and a protrusion on the air horn. 23. The sprayer of claim 21, wherein the nozzle portion includes a ridge member that acts as a mechanical stop for the collar. 24. The sprayer of claim 23, wherein the ridge member and collar are configured to permit rotation of the air horn without loosening the collar from a fully tightened position in which the collar is in contact with the ridge member. 25. The sprayer of claim 24, wherein the collar is threadably coupled to the nozzle portion. 26. The sprayer of claim 11, wherein the air horn and air diffuser include a second detent mechanism that inhibits rotation of the air horn from a second position and a third detent mechanism that inhibits rotation of the air horn from a third position. 27. The sprayer of claim 26, wherein the first position corresponds to a vertical spray pattern, the second position corresponds to a horizontal spray pattern and the third position corresponds to an angled spray pattern. 28. The sprayer of claim 27, wherein the angled spray pattern corresponds to an angle of 45 degrees. 29. The sprayer of claim 28, wherein the collar is threadably coupled to the nozzle portion. 30. The sprayer of claim 26, wherein each of the first, second and third detent mechanisms comprises a notch defined by the air diffuser and a protrusion on the air horn.