It includes a plastic cylindrical inner tube and a metal drum outer tube with at least one drain port. The inner tube matches the outer tube. The inner tube is composed of a base, a cylindrical inner tube and a port ring. One end of the inner cylinder is connected to the base, and the other end is connected to the port ring. The cylindrical inner cylinder is composed of two or more side wall plates and two or more ridge plates joined to each other. The side wall plates are A circular arc plate with four contour edges. The four contour edges are respectively connected with the base, the port ring and the ribbed plate, and are provided with a connection structure. The plate is provided with a plurality of dehydration through holes, and the ribbed plate is A circular arc plate with a convex edge in the middle, and its four contour edges are respectively connected with the base, the port ring and the side wall plate, and are provided with a connection structure, and the plate is provided with a plurality of dehydration through holes; the side wall plate and the rib plate When the cylindrical inner cylinder is connected to each other, the convex ribs on the ribbed plate protrude toward the inside of the cylinder to lift the ribs.
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