FIELD: fire prevention. SUBSTANCE: headpiece has casing formed as hollow spherical device and nozzle. Radius of spherical cavity exceeds maximum size of conventional working section of nozzle, which has nonround section of inner channel extending along helical line of surface. Window of noncircular section is positioned at casing and nozzle junction. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 2 dwg
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