Duct Non Return Valve 100mm Round Rigid Pipe Connector with Shutter Damper

Duct Pipe Connector 150mm with Non Return Valve / Back Draught Shutter Damper

EQUAL T 4" 100mm ROUND PIPE SPLITTER VENTILATION RIGID DUCTING ADAPTER WHITE

Metal Back Draught Shutter Damper, Spring Loaded Non Return Valve Backdraft Duct

100mm/4" Back Draft Draught Shutter for Inline Extractor Fan,Ducting joining pip

2 no. Spring Loaded Metal Non Return Valve 125mm Duct Back Draft Shutter Draught

Duct Reducer Extractor Fan Connector 80-150mm Ventilation Pipe Adapter