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SB Patio Pet Door H Channel is designed to attach to the top of all Security Boss Patio Inserts, and Side Sliding Window Inserts. This top H channel features a spring loaded design that is able to be adjusted 3 1/4". There are SB Patio Pet Door 2" Extensions (sold separately) that can be attached to the top of this SB Patio Pet Door H Channel. This adjustable H Channel is not compatible with any brand except for the Security Boss patio and window insert line of pet doors.