APC Parallel Communications Kit for Galaxy VS, Easy UPS 3-Phase Modular, and Galaxy PX Parallel kit including PBUS cables (25m) and two AUX contacts for UPS parallel systems. One kit needed for 2 UPSs, two kits needed for 3 UPSs, and three kits needed for 4 UPSs. Up to four UPSs can be paralleled for capacity (3 UPSs) or redundancy (3+1). Product or component type Kit Range of product Galaxy VS Range compatibility Galaxy VS Compatible Spare parts- 29452, VZ7