Vent Systems 12.5cm Straight Plastic Ventilation Duct Connector for HVAC Ventilation System with Valve

Vent Systems 125 mm / 5" Inch - Air Vent Duct Connector Flange - Plastic Ventilation Pipe with Valve - Ducting Connector for Round Flexible or Straight Pipes, Ventilation System HVAC

EUROPLAST 100mm / 4 Inch Duct Connector with Flange - Round PVC Ducting - Ventilation Pipe - Wall Plate

6" Inch Duct Connector Flange - Plastic Straight Pipe Flange for Heating Cooling - Inlet Outlet Ventilation System - Ducting Coupling Wall Plate - Assembly Joint Set (150mm)