3 Beavertail Streamline™ Ultrasonic Insert 3 Beavertail Streamline™ Ultrasonic Insert UI325K Streamline™#3 Beavertail Insert. Broad, flat "beavertail" tip, yellow resin handle, water delivery from the base of the tip, 25kHz SKU Handle Compatible Generator UI325K Resin SWERV3™ Where to Buy x Category Dealer PartnersSales RepresentativeStrategic MarketsSchools RepresentativeAccutron™ Equipment Sales Zip Code Find RepresentativeReset Select a category, input a zip code and click on Find Representative, or explore the complete list here.