Lay-in 450×450 Reducing Neck- Spigot 300

A 450x450mm reducing neck spigot adaptor for lay-in ceiling diffusers, fitted with a 300mm round spigot connection. Connects the lay-in diffuser face to standard round ductwork, allowing flexible duct sizing at the diffuser takeoff point. Essential for installations where the duct diameter differs from the diffuser neck size.