| CPC B60S 1/3415 (2013.01) [B60S 1/3479 (2013.01); B60S 1/522 (2013.01); B60S 1/3445 (2013.01)] | 9 Claims |

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1. A wiper arm for vehicles, comprising:
a wiper arm seat for connecting to a driver;
a wiper arm end piece for holding a wiper blade and an arm portion arranged between the wiper arm seat and the wiper arm end piece, wherein the arm portion is fixedly connected to the wiper arm end piece and rotates relative to the wiper arm seat;
at least one spray unit that is provided with a conduit and a spray nozzle, the conduit being guided along the wiper arm and the spray nozzle being arranged at one end of the conduit, the arm portion is provided with a cover plate, and the spray nozzle held at the cover plate;
wherein said spray nozzle is provided with an opening;
wherein the cover plate is provided with a raised first wall, a local area at a top of the raised first wall having a protrusion, and a width of the protrusion is greater than that of the opening, wherein the raised first wall is configured to be inserted into the opening; and
wherein the protrusion is configured to extend through and out of the opening; and
wherein the spray nozzle is also provided with a groove, where a portion of a side wall of said groove is in the form of a hook.
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