What does a water vascular system do?

Phylum Echinodermata, which includes starfish, sea urchins, sea cucumbers, sand dollars. It is used to operate the tube feet for locomotion.

Echinodermata

The water vascular system is a hydraulic system used by echinoderms, such as starfish and sea urchins, for locomotion, food and waste transportation, and respiration.

Water enters the system through the sieve plate, and then flows through the ring canal around the mouth. From the ring canal the water flows through the radial canal in the feet. The radial canal is...

ya, yes, si.... they do have a water vascular system. They use it for moving and getting food.:D hope this helped! :D