tube
fluid conveyance
dialysis tubing
medical device semipermeable membrane
bamboo tube
tube made of bamboo
glass tube
are mainly cylindrical hollow-wares.
sprue
channel through which liquid material enters a mold, or excess material that solidifies in such a channel and is later removed
capillary tubing
hollow cylindrical objects with an internal diameter that is small enough to fill by and hold liquids inside by capillary action