The cost to make one of these pumps is really minimal, especially if you can scavenge suitable parts because it doesn't have to look pretty as long as it works as its supposed to, I think this cost me about £15 in total to make ($25). 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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