- Top mounted 1″ drainage plug has sloped trough to eliminate water accumulation around the plug. - Recessed flanges and center trough allow the use of 2 Ft. or 4 Ft. centers. - Minimum wall thicknesses of 1/4″ and up to 5/16″ at fastening points making it extremely strong and resilient to splits and punctures. - 10 easy to get at locations from which to attach the float to stringers. - Dimensions (WxDxH): 24″ x 48″ x 16″. - 550 lbs. floatation capacity.