The Helios Fans RVBD 125 K is a specially designed device connection socket for use with KWL ventilation units. It features a dual-ended design with one short and one long DN 125 connection side, allowing flexible installation in confined or customized duct systems. Built for compatibility with standard duct components, it ensures a secure and airtight fit. This connector simplifies the integration of KWL units into residential or commercial ventilation networks, enhancing system efficiency and performance.