Related Clues:

• Go down the ___
• 'A series of ___,' infamous analogy for the internet
• Fallopian ___
• Cylinders
• Ziti and penne, shape-wise
• Pipes, for example
• Penne, essentially
• Bucatini, ziti and rigatoni, e.g
• Straws and didgeridoos, essentially
• Pipes from bath emptied slowly at first