PetSafe HPA11-10918 Pet Door, S Door, 5-1/4 x 7-1/2 in Flap Opening, Aluminum/Plastic, Brown/White Brown/White

Imagine a pet door installed behind a couch or in a utility room. The Wall Entry Door can be installed in interior or exterior walls or doors 4-3/4 to 7-1/4 in thick, including siding, stucco and even brick. Add an extension tunnel for deeper walls. This pet door features 2 flaps, one in the inner frame and one in the outer frame, for improved energy efficiency. The old model Wall Entry Aluminum Pet Door uses the Classic Replacement Flap.