You’ll need the STIHL nozzle holder if you want to mount one of the brass STIHL fan jet nozzles, a brass STIHL full cone nozzle or a nozzle from the STIHL nozzle set on your STIHL sprayer. The holder is made of plastic and reliably secures the nozzle in place.
The nozzle holder from STIHL is suitable for the STIHL SG 21 to STIHL SG 71 and for the STIHL SGA 85 battery sprayer.