Related Clues:

• Torso tubes
• Vital lines
• Tars at sea circling lake in vessels
• Circulatory pipelines
• Lines from hearts
• Vital vessels
• Vessels from hearts
• Vessels in lake — skill's needed to go round it
• Parts of highway systems
• Vessels in angiograms
• Ticker lines?
• Veins' counterparts
• Some circulation channels
• Conduits from ventricles
• Tubes in trunks