Brand: Parts Express. MPN: 090-1007. This 2.1 x 5.5 mm coaxial power splitter comes in handy when you have to power an amp board and a preamp board that require the same voltage. Instead of using two power adapters, add this Y-cable to a single power supply and save money and space. The 22 gauge wire handles up to 2.5A of current and the 1 ft. length adds additional versatility.