Mayne Fairfield 36 in. x 11 in. Self-Watering Black Polyethylene Window Box 5822B - The Home Depot
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Amazon.com : Mayne Fairfield 4ft Window Box - Black - 48in L x 11in W x 11in H - Polyethylene - Built-in Water Reservoir (5823-B) : Plant Window Boxes : Patio, Lawn & Garden