'Marine quality' - aha! same product, x3 times the price for the marine tag?
Not really: been using them for quite a few years. The £1 shop version lasts about a season because it is all bare cheap metal inside, corrodes like theres no tomorrow, and one day just when you need it - hey presto! No contact, or at best intermittent if you hold the plug at the one angle where it does make contact. A good squirt of WD or whatever might give it a few more weeks life.
The only ones I found which survive more than a few seasons on board are the expensive 'marine' ones which have special rubber caps which stop the salt getting at them. Even they do not last for ever.
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If you cant fix it, get a bigger hammer...
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