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https://king-wifi.win/wiki/UPV....C_Door_Panel_Replace
https://sciencewiki.science/wi....ki/Fitting_a_Cat_Fla
Cat and dog flaps installed with double-glazed doors allow your pets to come and go whenever they want. They are also great to keep your pet safe while you're away. It is possible to install a cat flap in an existing uPVC or double glazing sealed unit. But, you'll require a replacement part that has an opening that is pre-made. This can be accomplished by a glazier with the appropriate equipment and experience. Easy to install A cat flap is an excellent alternative