DOP350 with sand mining head, cutter unit & flat bottom head The American contractor Curtin Maritime Corp has taken delivery of a complete DOP dredging package. This package included a DOP350 including 3 types of suction heads for optimal flexibility. These exchangeable heads include a sand mining head, a cutter unit and a flat bottom head. Moreover the shipment contained hydraulic hoses and spare parts for a quick start-up and maximum uptime. See all deliveries