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Product DescriptionThis tapered ballast sac connects directly to your boat's existing ballast system and features a durable 60-gauge PVC construction. Sonic welded seams and fill drain ports ensure it withstands long-lasting use. The tapered ballast sac includes four 1" diameter external drain/vent ports. Bag must be filled using Eight.3 ballast pumps from Ronix. Fits most V-drive and bow lockers and still leaves room for your Ronix gear on top. 36"L x 18"W x 18"H.