Stihl Backpack Sprayer SG71

Skylarc Ref P173421

Stihl Backpack Sprayer SG71.
18-litre tank.
Pump lever on side.
Unknown what chemical/liquids were previously used within tank.
See the Stihl website below for further item specs:
https://www.stihl.co.nz/en/ap/sg-71-backpack-sprayer-2339