Language translator at button on page bottom – left.
8-year guarantee, warranty and diagnostic support,
8-year free guarantee, warranty and (link) diagnosis support: We will either prevent all the stray current that is the ONLY CAUSE of marine electrolysis corrosion or pay you back your purchase cost of SeaBis Master. How to Prevent Corrosion must be complied with. Guarantee here.
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External proof of that we say: Wikipedia – electrolysis. Note, the apparatus is powered by Direct Current (DC). As in batteries. Not AC – as in mains, shore or inverter power. So why waste your money on a Blocker?