ROCKFORD FOSGATE RFD4 0/1/4-Gauge Car Distribution Blocks 1-In 3-Out+Amp Kit NEW ROCKFORD FOSGATE RFD4 1/0 or 4 Gauge Ga Car Audio Power Distribution Block (1) 1/0 AWG/4 AWG inputs (3) 4 AWG/8 AWG outputs Branch the main power/ground wire to connect multiple amplifiers 100% solid brass with platinum planting