Airmar B117 Bronze Thru-Hull Transducer w/Humminbird #9 Plug - 7-Pin

The Airmar B117 Bronze Thru-Hull Transducer with Humminbird #9 Plug is the workhorse choice for serious anglers and boaters who demand reliable sonar performance without excessive drag or installation complexity. Designed as a direct replacement or upgrade for Humminbird systems, this 7-pin transducer delivers dual-frequency scanning that lets you read structure, thermoclines, and fish at multiple depths simultaneously—critical when you're hunting walleye in deep basins or working shallow flats for bass. Whether you're retrofitting an older unit or building a new console, the B117 integrates seamlessly into Humminbird ecosystems and performs consistently across freshwater and saltwater applications.

At its core, the B117 features a 50/200 kHz dual-frequency single ceramic element that balances high-resolution detail with effective range. The bronze thru-hull construction resists corrosion and delivers superior acoustic coupling compared to plastic alternatives, ensuring clean signal transmission even in thermally stratified water. The nearly-flush low-profile housing projects only 5mm (3/16") beyond your hull, minimizing hydrodynamic drag and protecting the element from prop wash and debris—a thoughtful engineering choice that keeps your boat's speed and fuel efficiency uncompromised. At one pound, it adds negligible weight while the compact footprint makes installation straightforward on most hull designs.

This transducer is ideal for tournament anglers, charter captains, and recreational boaters running Humminbird fishfinders who refuse to compromise on sonar reliability or image quality. The bronze thru-hull design excels in saltwater and brackish environments where corrosion is a real threat, while maintaining the thermal stability freshwater anglers depend on during summer fishing. Installation requires a properly sealed thru-hull fitting, and the 7-pin Humminbird connector ensures plug-and-play compatibility—no rewiring or adapter frustration. If your sonar has gone silent or you're upgrading from an aging transducer, the B117 delivers the directional clarity and frequency flexibility that separate confident boat control from guesswork.