Furuno 165T-SS54 Stainless Steel Thru-Hull Transducer f/DFF3D Sounder [165T-SS54]165T SS54 Stainless Steel Thru Hull Transducer for DFF3D Sounder Stainless Thru Hull Multi Beam Transducer The 165T SS54 is a multi beam transducer for the DFF3D that affords a 120 degree port starboard view of the underwater world. A built in motion sensor stabilizes the display to give clear and stable images. Features: Stainless Steel Thru Hull with high speed fairing block Can be flush mounted in keel without using fairing block DFF3D operating