Petsafe Staywell Original 740 Medium Dog Flap Pet Door Easy 2-Way Locking, White

With this 2-way pet door, your small dog and/or cat can come and go as they please through the transparent flap. The flap opening is 281mm x 237mm and accommodates pets up to 18 kilograms, with shoulders that are up to 219mm. This doggy door can be installed on most doors or walls with a space of 352mm x 294mm. Change to locked mode when you want them inside.