Model # 17131: The exclusive, patented Ameda HygieniKit is one of the most effective milk collection systems available. It helps mothers provide the purest milk possible to their babies. The kit's unique silicone diaphragm acts as a barrier, separating the user from the suction source. This helps ensure milk purity by preventing contaminants from coming in contact with collected breast milk, and prevents milk back-up so tubing and pump require little to no maintenance. The HygieniKit offers mothers the choice of single or dual pumping. It also easily converts to manual pumping with the One-Hand Breast Pump (not included).