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I'm really new to Mathematica, trying to learn some things, but I need help trying to plot this kind of cylinder, a U tube like cylinder. Tried to use an example code like this, and then vary some parameters, but still unclear on how to do that. Any help is apreciated.

Graphics3D[{Yellow, 
  Cylinder[{{v1 t, 0, h1}, {v1 t + Δx1, 0, h1}}, Sqrt[A1/π]], 
  Cylinder[{{8 + A1/A2 v1 t, 2, h2}, {8. + A1/A2 v1 t + A1/A2 Δx1, 0, h2}}, Sqrt[A2/π]] 

Also I have used this

Tube[{{4, 10, h1}, {4, 3, h1}, {3, 0, h2}, {10, 1, h2}},
  {Sqrt[A1/2 π], Sqrt[A1/2 π], Sqrt[A2/2 π], Sqrt[A2/2 π]}]}
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Tube is helpful in this regard, for example:

tube[r_, l_, rt_] := 
 Graphics3D[{CapForm["Square"], 
   Tube[Join[Table[{-1, 0, j}, {j, l, 0, -0.1}], 
     Table[-{Cos[t], 0, Sin[t]}, {t, 0, Pi, 0.1}], 
     Table[{1, 0, j}, {j, 0, rt, 0.1}]], r]}, Boxed -> False]

Visualizing:

Manipulate[tube[i, j, k], {i, 0.1, 0.5}, {j, 0.5, 2}, {k, 0.5, 2}]

You can modify an customize: enter image description here

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