Enhance your door's functionality with this internal draught excluder letterbox. It features integrated brushes to block draughts and an internal water seal to prevent leaks, ensuring your home stays comfortable and dry. The anti-snap flap opens a full 180 degrees, allowing easy access and reducing the risk of damage. With an adjustable sleeve, this letterbox fits doors between 20mm to 40mm thick, making it suitable for most uPVC, composite, and timber doors. The 12" length ensures a perfect fit for your needs. The overall size is 306mm x 70mm.