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Two-layer conveying pipe with a wear-resistant inner pipe and a pressure-bearing outer pipe. The inner pipe is uniformly through-hardened over its entire length. The wear layer has a hardness of 67 HRC. The ESSER TWIN 900 XL series has a reinforced inlet extension and is placed in the mast behind the bends to compensate for wear caused by turbulence. It is designed for high massive wear.