Fitmount Toothbrush Replacement Heads Compatible with the Following Models: Fit Waterpik Sonic-Fusion, Fit Waterpik Sonic-Fusion 2.0, Fit Waterpik Sonic-Fusion Professional, Fit Waterpik Sonic-Fusion Professional 2.0, Fit sf 01 01w 01c sf01 sf01w sf01c sf-01 sf-01w sf-01c, Fit sf 02 02w 02c sf02 sf02w sf02c sf-02 sf-02w sf-02c, Fit sf 03 03w 03c sf..