Cavitron FSI Focused Spray Powerline Ultrasonic Insert – 30K-FSI-1000 #80799Cavitron Focus Spray Insert series is an ultrasonic insert that provides increased scaling and deplaquing performance, with less water. These instruments are for use with all Cavitron ultrasonic scaling units. For gross deposit removal Provides improved view of working area Patented internal water delivery system delivers water directly to the insert tip and focuses the water where it is needed most.