This is the complete Makita Power-head. It has the Custom Filter installed and all other necessary modifications done to it. The Power-head was updated on 10/15/2015 and it requires the NEW BAR (CSD-SP-10-50) also. You will need to specify which model you have when ordering parts for it. The earlier model is a UC3530A or UC4030A. The newer model is a UC3551A.