Scanstrut DS21A-P-BLK Vertical Cable Seal - Black *5-Pack FHWASH3 Prevents back flow of current

Prevents back flow of current from the battery to the panel

From there

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Scanstrut DS21A-P-BLK Vertical Cable Seal - Black *5-Pack FHWASH3 Prevents back flow of currentDS21A P BLK Vertical Cable Seal Black **5 Pack Scanstrut premium IP68 waterproof cable seal provides easy fit cable routing that cuts down your installation time and is the only guaranteed and proven watertight installation for your antenna and navlight cables. Features: Watertight installation 100% waterproof with an IP68 rating Easy and reliable installation each unit is supplied with both pre drilled and blank inner seals to make your installation