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Towermax CO/4x4 Towermax CO/4x4 for up to 4 CO lines RJ-11/45. Protects four CO lines. Features 8 RJ-11/45 jacks through 4 ports (4 lines 4 equipment - pins 4 5 each port). Use with Towermax KSU base unit. Includes four RJ-11 7-foot phone cords. Clamping level 240 volts.