This product is designed to allow a standard 110mm external diameter plastic drainage pipe to be attached to the lower rear opening of the Telescopic Underfloor Ventilator. It is part of Timloc’s Underfloor Vent System. It is a Vent Duct Adapter piece that has been designed to be used with the Telescopic Underfloor Ventilator. When attaching the adaptor, the vermin grille can be left in its position. Features & Benefits Does not restrict airflow through the main telescopic underfloor ventilator Purpose-made accessories eliminate the need for on site modifications Lightweight and easy to handle Durable and totally resistant to decay Robust material Product Specification Suits: 100mm External Diameter Colour: Black