A series of tubes.

Previously.

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6 Responses:

  1. mhat says:

    Huh, saw the same thing yesterday on 4th between Brannan and Bryant.

  2. illyich says:

    Somebody is clearly doing something VERY important.

    • strspn says:

      It's a hydrant diffuser for reducing water force out of the hydrant when flushing sediment, which has to be done once every few years on old mains.

  3. pyrop says:

    YOU GET TO DRINK FROM THE FIRE HOSE!