What are the maximum and minimum pipe diameters the robot can support?

Error message

• Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /home4/belassal/public_html/cabotics/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /home4/belassal/public_html/cabotics/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /home4/belassal/public_html/cabotics/includes/common.inc).
• Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home4/belassal/public_html/cabotics/includes/common.inc).