Does milk come in contact with the water in the breast shield assembly? Natalie March 20, 2017 23:19 Follow The Naya Smart Breast Pump uses a closed system which prevents milk from coming into contact with the water in the system. Related articles What happens if my tubing begins to leak water? How do I make sure my breast correctly fits the breast shield? What is the Naya Smart Breast Pump’s suction strength? Suction What is the frequency of cycles? Comments 0 comments Article is closed for comments.