Two-layer conveyor elbows with a highly wear-resistant CCI inner elbow and a pressure-bearing outer elbow. Elbow extensions also lined with CCI. Inlet and outlet protected by CCI Big Mouth weld ends. The wear layer has a hardness of 67 HRC. The ESSER TWIN 900 series is designed for high massive wear. These elbows are mainly mounted on the deck of a truck-mounted concrete pump.