Trixie 2 Way Flap Model 3879 For Dogs - M-Xl Simple door for outer and inner doors. With flexible transparent flap with silent action. Suitable for medium to large breeds Product Features:Sturdy metal bar at lower end of flapLockable with removable metal rear panel which protects against intruders and against wind and bad weatherIncl. tunnel element (fits door depth 19-32 mm)Can be extended with additional tunnel elements