Abstract: An ejection nozzle for high pressure and low pressure cleaning apparatus having a cylindrical hollow body (14) with a front flange (31) having a central inwardly projecting cavity (33) and provided with a central narrow orifice (32), and at least two annular orifices (34), a distributing valve (20) with a central duct (26) sealingly slidable in the cavity of the cylindrical body (14) and having an external front portion (20') mating the central cavity (33), an exterior coaxial cylindrical shell (10) consisting of a front portion (12) fixed to the cylindrical body (14), and a rear portion (12') slidable on the body (14), and a device for placing the front portion (20') in sealingly engagement with the central cavity (33) in the high pressure ejection and out of the cavity (33) in the low pressure ejection.