North Star M1573001A - Manual (Page 13)

Operation Instructions
13
Spray Gun Safety Lock
When not spraying, use the spray gun safety lock to prevent accidental high-pressure discharge.
* Note: Depending on model, gun may appear differently.
Attaching the Lance
Tighten spin-on coupler hand tight.
Note: The o-rings make the seal so there is no need to tighten with a wrench.
spray gun
spray gun safety lock
lance
spin-on coupler