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Used as a top of inspection chamber size 315/315 and 315/400. Based on a smooth pipe DN 315 and applied to rising corrugated pipe 315, smooth pipe 400 and corrugated pipe 400 with the aid of gaskets: OW315/315, GW 315/400, DW 315/400, WK 315/400. The hinge enables to open the grate to the angle of 100°.