One of these 4" manual gold pumps can fill a 1/4" classifier in just 3-4 draws depending on the material being worked, so they can save a lot of time compared to smaller versions of the pump which can take 5-10 minutes to fill the same classifier. These pumps are great to use where you are not allowed to use any mechanical processing to remove material from rivers & streams as this is a purely manual process. I have a previous build version of this 4" manual gold pump on my youtube channel but due to trial & error, I have improved upon the previous design to make my 4" manual gold pump lighter, lose less material and create a smoother suction vacuum. Here's a video showing how I've redesigned and made my monster 4" manual gold pump/dredge.
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