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: 24" x 48" x 16" high and a tare weight of 40 lb.