The Helios FRS-WDV 2−75÷125 is a Flexpipe wall mounting set designed for the connection of DN 100 or DN 125 supply or exhaust air valves (available separately). It includes a pipe socket for secure valve attachment and offers two duct connections compatible with NW 75 pipes. Made from galvanized sheet steel, this unit provides a durable, corrosion-resistant solution for efficient ventilation installations.