This U-shape bow 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 ballast sac includes multiple 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. 62"L x 48"W x 8"H.