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This inner dome from Specialty Recreation finishes the interior side of a 15" x 18" RV skylight opening. Like their exterior domes, it's made from high-performance thermoformed polycarbonate, so it holds up over time and stays easy to clean.
This is the white, obscured (non-clear) version. Make sure the inner dome you order is the exact size of your existing hole, since inners must match precisely rather than just meet a minimum size.
Pair with a matching exterior dome if you're replacing both sides of your skylight.
