Graco M2K Instructions - Parts Manual page 24

Operation
9. Trigger gun for 3 seconds into a grounded metal
waste pail holding a metal part of gun firmly to the
pail.
10. Close B side solvent flush valve.
11. Open A side solvent flush valve.
12. Trigger gun for 3 seconds into a grounded metal
waste pail, holding a metal part of gun firmly to the
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pail, until the mixed fluid is purged from the system
and clean solvent is flowing.
13. Close A side solvent flush valve.
14. Open B side solvent flush valve.
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