https://www.openlearning.com/u..../mercadomurray-sm4ux
https://squareblogs.net/bargeb....ell79/how-to-train-y
https://articlescad.com/how-to....-train-your-cat-to-u
It is possible to install the cat flap inside a upvc door panel or double glazing glass sealed unit but the best solution is to buy a new glass pane that has a premade hole installed. Follow the directions included in your kit. Make sure that the shape you have drawn (be it circle or square) is accurately depicted on the template. Safety A m