Here is one where I cut the 4” at a 45 and just rotate your cut and glue it back together. I reduce it to a 3” on the intake plus put bolts across to keep large rocks out .
It’s not going to win a beauty contest but as long it works for you.
This is PVC going from a 4 to a 3”because most places you dredge will require it to be neck down to a 3” .
This is fixed for a jet are suction nozzle. The dredge I make is nothing you’ve seen before but works great for me .
Cheap to make but don’t get hollow core because solid core will last longer. If you’re getting it in 4foot they will have a sign above it saying what is what.
My advice would be to take everything to your local gold and jewelry buyers, pawn shops to see what they might offer for everything. The more places you take it to, the better idea you'll get value wise..Then take the best offer if you're happy with it.. Impossible for anyone here to give you a value without being able to see everything in person.