The Ferplast Swing 5 is a robust flap for small dogs and cats, made from durable plastic, which can be installed in various types of structures and materials: wood, glass, metal, and masonry walls. It features a 4-way locking system that allows you to select the operating mode: exit only, entry only, entry and exit, or total lock (preventing the pet from entering or exiting). It incorporates the Wind Stopper system to prevent draughts and a useful last-pass indicator to let you know if your pet is inside or outside the house. The flap includes a partial tunnel, but can be complemented with an extension tunnel (purchased separately) for installation in doors or walls thicker than 5 cm.