Product Details:
Bronze Thru Hull 3-in-1 Transducer Bronze Thru-Hull Transducers Are For Large Boats And For Boats With In-board Motors That Make Typical Transom Mount Transducers Ineffective. They Are Not Recommended For Trailered Boats As The Transducer Is Not Flush With The Hull. Bronze Thru-Hull Transducers Require That A Hole Be Drilled In The Hull And The Shaping Of A Fairing Block. Professional Installation Is Recommended. Plastic Thru-Hull Transducers Are An Alternative To Bronze Thru-Hull Transducers Description: Bronze Thru Hull Tri Ducer, Dual Beam, 20/74 Degree, 200/50kHz With Temperature And Speed. Transducer Size 7"L X 2.5"W X 1.25" D(below Hull). Front Shaft Diameter: .75", Back Shaft Diameter: 2". Fairing Block Included. For Use With: 931C DF, 937C DF