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What Is It? | White Plastic Box

Ask This Old House general contractor Tom Silva asks plumbing and heating expert Richard Trethewey, landscape contractor Roger Cook, and host Kevin O'Connor to guess what this white plastic tool with a louver at the bottom and an opening on the top might be

In this video, Ask This Old House general contractor Tom Silva asks plumbing and heating expert Richard Trethewey, landscape contractor Roger Cook, and host Kevin O'Connor to guess what this white plastic tool with a louver at the bottom and an opening on the top might be.