Sea-Dog 14/3 AWG Flat Triplex Wire - White/Green/Black - 100' [8014302]14 3 AWG Flat Triplex Wire White Green Black 100' Tinned Copper Stranded Wire. Sea Dog Marine Wire is offered in 16 3 6 3 gauges for triplex boat cable installations. All Triplex wire is sheathed in flexible PVC and is flat in construction. It is designed and manufactured for marine use with tinned copper wire for corrosion resistance and improved conductivity. The copper is annealed and finely stranded to offer flexibility and resistance to vibration