Check the listing for details. Ideal Pet Medium Plastic Pet Door. Condition: New. Listed at 44.88 USD. Sirr0und Ideal Pet Medium Plastic Pet Door Features inner telescoping frame that adapts to doors of 1-1/4" to 2" thickness. Impact-resistant super-strong thermoplastic. Clear vinyl flap with patented edges won't warp from use or extreme temperatures. Floating bottom threshold for perfect seal. Lock-out slide keeps pet out of mischief when unsupervised. Tamper-proof mounting - door cannot be removed from outside. Easy installation - average installation time is 20 minutes. How to select the right pet door: Step 1: Measure your pet from the top of the shoulders to the chest, just behind the front legs. Step 2: Determine your pet's weight. Step 3: Select the correct door size based on your pet's measurements and weight. MPN# PPDM SKU# 815454UPC# 30559200002