It is a giant project, made few years ago, for the production and laying of a double line of concrete pressure pipes with ID 4 meters and 900 km long. Pipes produced according to AWWA C301 Standard - Embedded type
https://mega.nz/#!4NsEDTZR!ZVYK1Rg_GZV4UmFYt8zqecdYh0miicoX6jkbAfdRWHo
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Neat project…
Dik