Making 1200 liter water tanks - GIF

Making 1200 liter water tanks.

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Previously:

Blow molding plastic water tanks - GIF
Demolished water tank falls on excavator - GIF
Explosive hydroforming of spherical tanks - video
Explosive spherical tank forming - GIF

And that would be called Roto Molding

If I just saw that tank, I would say it was blow-molded.