Ferplast Cat Doors Swing 3B, 4-way flap for dogs and cats. Dimensions: 22.5 x 5 x h 25.2 cm. Universally suitable for all materials. Thanks to 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. An important component is the accessory (not included in the Swing 1 model), which allows you to customize the type of opening to your needs: entry only, exit only, both entry and exit, or closed. All larger cat doors are equipped with a tunnel, so the flap can be attached to any structure. For the Swing 5 model and the Swing 1 and 3 models for smaller pets, a new modular tunnel extension is available as an accessory. This extends 5 cm deep (screws are not included). We recommend consulting a glazier before installation in glass constructions, as it is not possible to drill holes in safety glass or double glazing.