Ferplast Dog Door Swing 15 for large dogs. With tunnel; door closes gently; 4-way locking system. Thanks to the Ferplast Swing products, you can install the flap exclusively for your four-legged friend on any wooden, metal, or glass door as well as on brick walls. The model 15 is recommended for medium to large dogs and large cats. The flaps come with the innovative Windstopper system, which provides protection against drafts. Another important feature is the system that allows you to adjust the type of opening to your needs: entry only, exit only, entry and exit, or closed. The passage indicator shows you whether your pet is inside or outside the house. This consists of a flag attached to the bottom of the cat flap, indicating the direction in which your furry friend last moved. All larger flaps are equipped with a tunnel, allowing the flap to be installed on any structure. We recommend consulting a glazier before installation in glass constructions, as it is not possible to drill holes in safety glass or double glazing. Universally suitable for all materials.