TOWERMAX CO4/110 PAN-MCO4110 Protection of 4central office lines using a combination of 110 punch-down blocks and RJ-45 connector jacks. Versatility is the key as either punch down or modular cable can be used to connect the protector to equipment. Includes four RJ-11 7-foot phone cords and four reusable cable ties. Use with Towermax KSU base unit. Clamping level 240 volts.