Our Cobalt 6 Discharge Ports - The perfect balance between wear life and cost, Wesso.'s Cobalt 6 Discharge Ports are an excellent value. While it is an economical alternative to tungsten carbide, Cobalt 6 will still outlast similar parts made of stainless steel. The machines they go on are the Sharples P3400, Derrick DE1000, and most Kubco centrifuges. In-Stock.