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A Marr connector is a brand name for a wire nut. They were one of the first companies to make a wire connector and the name in the trade has stuck. When joining wires together it is still referred to marretting the wires together. I prefer B-Caps as more wires can be gathered together. Marretts were made in three sizes 31's, 33'sand 35's. Depending on the size of the wires to be joined together will govern the size of the wire nut.

There is a great article on related links below that gives a bit of history as to how they became into being.

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