I am thinking of a 4 inch suction pipe supplied from a 2 inch pressure hose same as in the photo but I am wondering will I have to reduce the diameter of the pressure pipe as it enters the suction pipe, I am sure I have read somewhere that the reduction should be approx times 4 so that would make the reduction diameter at 1/2 inch as it joins the suction hose. So I am looking at getting one made from a local blacksmiths at short notice. First post on this very interesting and informative site, I'm looking for a some advice from the experienced dredging people on this site, I am from England and am looking to remove a considerable amount of sand and small pebbles/rocks from the seabed at approx 30ft depth, I was looking at buying a 4 inch suction nozzle from an ebay site based in the USA (photo below) but as this job will be coming up in the next week, the delivery time is too long.
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