Airmar 175Wr-4 Transducer Housing Wrench - For Use W/B164, B175, Ss164, Ss264

175Wr-4 Transducer Housing Wrench-. A Single-Handed Wrench That Holds The Main Thru-Hull Housing Via The 'Wrench Flats' On The Top Of The Housing To Facilitate Tightening Of The Hull Nut.. Use Wrench 164Wr-2 Or 164Wr-3 For The Hull Nut.. For Use With:-. B164. B175. Ss164. Ss264. Important:- The Design Of The Housing For These Transducers Changed Slightly In June 2012. This Wrench Is For The Newer Design And Has An Internal Width Of 2-3/4". If You Need A Wrench For The Older Designs Then Use The 164Wr-4 Instead, With An Internal Width Of 2-7/16".. Airmar 175Wr-4 Transducer Housing Wrench. Airmar Wrench F/ B164, Ss164 Ss264 B175. Marine Navigation & Equipment. Transducer Accessories. C-Wave175Wr-4.