12 volt lead for glx3000NR

Hi anyone recommend a 12 volt cable to fit the router, also what filter/protection should be added..it’s going onto a 12v leisure battery in a campervan

An adapter about this kind of cable:

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As for the connector, you need a DC 5.5 mm x 2.1 mm connector.

12V 24 V DC 5.5mm x 2.1mm Car Cigarette Lighter Extension Power Supply Adapter Cable with LED for Car Truck Bus Van(10FT) : Amazon.ca: Automotive)

I've seen these before with different outputs.

My RV has 12v cigarette outlets inside for 12V devices.

Test voltage polarity too.