Neptune Systems AquaBus Cable engineered for Apex Controller systems. This 30-foot M/F cable connects your Apex base unit, modules, and Energy Bars with reliable communication support. Designed for flexible daisy-chain or star topology configurations, it enables seamless modular expansion across A3, A2, and A1 controllers. Compatible with all Neptune Systems modules and Energy Bars. Critical: Despite USB-style connectors, this is not a USB cable—never connect to computer ports or non-Apex devices, as this risks permanent damage to both your Apex system and connected equipment.