The PetSafe Wall Entry Pet Door (Medium) gives dogs up to 40 pounds the freedom to go in and out through a wall, while blending a discreet doorway into your space. It supports interior or exterior wall installation in walls 4-3/4" to 7-1/4" thick, including siding, stucco, and brick. 
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Flap Opening Size: 8 1/4" W x 11 1/4" H — suitable for pets up to 40 pounds
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Frame Dimensions: 12 1/4" x 17 1/8"
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Cut-Out Dimensions: 9 9/16" x 14 5/16"
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Wall Thickness Compatibility: Fits walls 4 3/4" to 7-1/4" thick, including siding, stucco, and brick
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Double Flap Insulation: Two flaps with extra strong magnets for excellent insulation
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Adjustable Sill: Adjustable sill helps seal the bottom and reduce drafts
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Locking Panel: Non-rusting locking closing panel for secure use when you don’t want the door open
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Telescoping Tunnel: Durable plastic tunnel that adjusts to fit both 2" x 4" and 2" x 6" wall construction
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Installation Kit: Easy do-it-yourself installation kit included to simplify setup
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Closing Panel: Slide-in closing panel included for quick closure when needed
This door gives pets up to 40 pounds the independence to come and go, reducing the need to open doors manually and offering a flexible living space. The double-flap design and magnets help minimize drafts, aiding in maintaining room temperature. The telescoping tunnel supports common wall constructions (2x4 and 2x6), making installation feasible in many homes, including spaces behind furniture where you want to keep the doorway discreet. The included installation kit, slide-in closing panel, and sizing chart further simplify setup and ensure you select the right size for your largest pet.