https://www.theoutfittersgeneralstore.com/airmar-75wr-4-transducer-housing-wrench.html
Airmar 75WR-4 Transducer Housing Wrench
Airmar 75WR-4 Transducer Housing Wrench- 75WR-4 Transducer Housing Wrench A single-handed wrench that holds the main thru-hull housing via the 'wrench
airmartransducerhousingwrench