One might consider using threaded fittings or a compression coupling at the valves to be able to remove them easily. I left some pieces unglued when I made my hydraulic shovel ( basically a big syringe) and after a while they no longer fit tight enough. Sand wears the pvc down pretty fast.
White pvc in large sizes gets spendy quick, and fittings are a little harder to find in 2"+ size for the white. There is usually a better selection of pieces parts in the ABS is why I use it. I did use white for my smaller diameter devices like the suction dredge. Very light and low cost both important for my uses
Another source of good pipe is craigslist. I'm always seeing leftover pipe for sale on there, if you have a little patience to wait. Often I'm in a rush
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