Cavitron FSI® Focused Spray Powerline® Ultrasonic Insert, FSI-1000, 25KCavitron 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 removalProvides improved view of working areaPatented internal water delivery system delivers water directly to the insert tip and focuses the water where it is needed most