MSW Motor Technics MSW-ES-1010 Manual De Instrucciones página 51

d) Unlock the trigger of the gun and point it at the waste bucket,
etc., then squeeze the trigger.
IMPORTANT: in the case of cleaning from oil-based paints, the
gun should be grounded while releasing pressure - for this
purpose, its metal part (e.g. the corner of the handle) should
touch the metal container for paint residue that stands on the
ground.
e) Keep the trigger pressed until the residual air, water or solvent
escapes from the gun.
3.3.4 Spraying material
a) Making sure the ON/OFF switch is in the off ("O") position and
the gun trigger is locked, install the spray nozzle in the gun tip.
IMPORTANT: when tightening the spray nozzle in the tip before
final spray setting the tip should be slightly skewed so that after
tightening they are flush - see example picture below for
horizontal setting: