DIY Hand Dredge Pump

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Description:
This is my design of a DIY hand dredge pump (see link below for original inspiration). The motivation behind this is that I wanted to make this more affordable.
https://www.youtube.com/watch?v=QQFXjMorOO8&t=28s
In the end this design cost me about $75, which is way less than the typical $175 options out there.

BOM:
For the pump and sluice tube I used 2"x36" pvc pipes. I made them extra long so I can get deep in a river if need be.
For the handle and piston I used 1" diameter pvc pipes

For the hose I used this part:
https://www.lowes.com/pd/STAR-Water-Systems-Plastic-Hose/1000678131
You can get a good deal on a hose at walmart at this link:
https://www.walmart.com/ip/LITTLE-GIANT-SPDK-Sump-Pump-Hose-Polyethylene-Dia-1-1-4-In/161323725?wmlspartner=wlpa&selectedSellerId=1122&adid=22222222227057768470&wl