This BEP marine battery isolator is of better quality than the cheapo T key car type, with a higher current rating and self cleaning contact action. I had three including the heavy duty version fitted to my last boat. The key which is very much less common can be removed after use.

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Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone