Made of top quality polyvinyl chloride (PVC), SEA-GEAR buckets boast an easy to use snap-together design and a permanent mesh screen. The units are available in standard outside diameters of 3 1/2”, 4 1/2” and 6 1/2” and arrive with the necessary rubber coated hose clamp for quick and easy attachment to the net. The nylon micron mesh window is generally the same mesh as the plankton net and must be specified at time of order. Model numbering system for this item identifies the outside diameter and length of filtering bucket bottom section in inches.