Cable strain relief type ZL // ZL 121: Black. The ZL strain relief bar can be used wherever wires, cables, individual conductors, or hoses need to be securely, easily, and cost-effectively strain-relieved or guided. The insert sleeve ELB prevents cold flow properties at the strain relief fastenings. For a double-decker setup, the spacer sleeve DH is required. Approved for railway technology (EN 45545-2).