Navico B744V 50/200 kHz Smart xSonic 9-Pin TH w/Fairing Block [B744V-9N]B744V 50 200 kHz Smart XSONIC 9 Pin TH with Fairing Block Bronze Thru Hull with High Speed fairing block. The Lowrance Bronze Thru Hull, style B744V, 600w, multisensor provides accurate depth, speed, and temp readings and comes with a High Speed Fairing Block. The high speed fairing block provides a streamlined installation and allows for a vertical beam. Compatible with Lowrance HDS, HDS Gen2, HDS Gen2 Touch, HDS Gen3, Lowrance BSM 1, Lowrance Hook,