1. Unscrew all hoses from 1st stage with the universal tool being careful not to damage the chrome plating.
Remove all the plugs from the 1st stage with the 4 mm allen key of the universal tool.
Remove the o rings from the plugs with the o ring extractor and inspect.

2. Remove the inlet protector and the protector cap for the recent models.

3. Take the field handle tool and use preferably for strength the bigger thread 7/16"
screw it in the HP port.

4. On the latest models, remove the plastic protection cap. Now unscrew the cap with the universal tool.

5. Carefully remove the piston, the spring and the nylon washers;

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