When one Digi-Troll&trade unit is connected to a Digi-Troll™ transducer, other units can be interphased with the master unit using this relay interphase cable. This allows all Digi-Troll™ units connected to the master unit to independently operate the bottom tracking feature, while only using one transducer.
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NGK Spark Plug (ITR4A15) (8M2018369) - Mercury
Cannon Manual Downrigger - Easi-Troll ST 




