AMP STACK modular connectors are for mass termination of communication cables with solid conductor wires. They are available in dry, flame-retardant or pre-sealed versions of 10, 20 or 25 pairs. Choose Mark III for 20 and 25-pair modules. Select Mark IV for 10-pair modules. Based on IDC technology, they incorporate cut-off blades to trim the excess wire when the connector is crimped.