DOP250 with cutter unit A submersible dredge pump type DOP250 has been delivered together with its cutter unit to Knoop Machinery. They added their knowledge on excavators – the DOP is attached to one – and shipped the instant dredger out to British Guyana. There the dredger will perform maintenance dredging activities in the country’s vital drainage channels. These channels keep the water level down – a vital requirement as the coast is below sea level. See all deliveries