This is a service kit for Clean Energy waste oil furnaces, all models including CE-140, CE-180, CE-250, CE-330, CE-440 and the boiler CE-340. Nozzle size selected when adding to the shopping cart. The 140/180/250 use the 9-5 nozzle. The CE-330 and CE-340 can use the 9-5 or 9-8 nozzle but adjustment to air and air bands may be needed. CE-440 uses the 9-8 Nozzle only. This kit includes: 1- Nozzle, 1- Electrode, 1 Regulator Kit plus regulator base o-ring, 2 solenoid plungers, plus solenoid o-rings.