Anode with or without the washer

SolentPhill

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Why do you buy some a anodes with a washer/ gasket and some without? I thought an anode should touch the metal it's attached to so why do some have this gasket?

I put one on my trim tabs today and it didn't have one.

phill
 

David2452

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They can make a good electrical contact through the mounting bolts(s) even with a gasket, but they don’t really need one. A gasket can be useful if mounting through GRP for a bonded bar or similar.
 

coreng

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Explanation : Anodes are more efficient when their plating does not touch what they are supposed to protect (legs). But for trim tabs, no importance...
 

VicS

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I think the backing pad is only used when fitting to GRP or to wood.
 
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