Low noise flat nozzle, 1/2 - 27 UNS, Safety nozzle for high performance air gun, nickel-plated brass, Nozzle width 21.5 mm
If correctly designed, these noise-reducing nozzles guarantee a lower noise level than conventional one-hole types with an identical blowing force.

They are usually fitted with a noise-reducing plastic insert and they are recommended by the German BGIA (Institute for Occupational Safety and Health).