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Amazon.com has VEVOR Trench Drain System with Plastic Grate, 5.9x5.1-Inch HDPE Channel Drainage for Garden, Driveway - 6 Pack on sale for $105. Shipping is Free.
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About this item [list][*]Low-profile Drain System: Dimensions of each channel: 5.9" W x 5.1" H x 39.4" L. Commercial water drainage systems allow safe and efficient drainage for grassed areas, gardens, farms, patio areas, pool sides, office buildings, driveways, or factory interiors. The anti-flotation design prevents floating and doesn't require staking when setting in concrete.