The .375" or 3/8" diameter was actually .393" and was too large to fit into a standard 3/8" swivel nut or 6AN swivel nut to fit. Also, it's not galvanized tubing - it's magnetic, but the Chinese version of zinc is more akin to cadmium. because of their poor metrology and math skills, because the outside diameter minus two wall thicknesses is not equal to the inside diameter.
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