Extend the height of your Hakuna Pets Patio Pet Door by 100mm with the Patio Pet Door Extension. Add to the top of your Patio Pet Door to fit taller sliding door tracks or install at the base of the pet door to increase the flap height for larger dogs. Black Silver White Bronze Small #1129 #1142 #1092 #1093 Medium #1130 #1144 #1094 #1095 Large #1131 #1146 #1096 #1097 Add Height: Extend pet door height by 100mm Durable Construction: Powder-coated solid aluminium frame Easy Install: Slide on and attach with supplied screws *Please note a maximum of 3x Extensions can be used together. *Compatible ONLY with Mesh Patio Pet Doors, Glass Patio Pet Door Extensions can be found here. Installation *Philips Head Screwdriver required for installation Slide extension onto top of Patio Pet Door Secure in place with provided screws