We honestly have no understanding of this kind of mechanism... but it looks awesome!

it uses presurized water into the smaller pipe to drag water through the bigger pipe
thereby enabling one to suck up sand and rocks up to six inches in size

Yep I have seen a couple of those that size a few bigger if they are trying to move a lot of stuff in a hurry... I know a few that do gold dredging, I use to get asked to fix there stuff from time to time. They would give it to me on monday and hoping I could have it done before friday so they could go back up for the weekend.

Paint it bright pink, and you could put it in an art gallery as an abstract!