Quincy Compressor 50093-103 - Manual (Page 73)

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4. Back off look nut as far as possible. Make sure back-up washer is not loose and is pushed up as far as possible.
5. Screw fitting. Hand tighten until back-up washer contacts faces of the port.
6. To position the fitting, unscrew by required amount, but not more than one full turn.
7. Use two wrenches, hold fitting in desired position, tighten lock nut securely.