This is a Service / Maintenance kit for Clean Burn burners; CB 525 S2, CB 550 S2 and CB 551 H3 or CB 551 H5 it comes standard with the 9-5 Nozzle #32000 and other common replacement / rebuild parts including; air and oil regulator kits, electrodes, air and oil solenoid plungers, and various O-rings.  

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