For Medela Swing, Mini Electric And Harmony Breast Pumps: This Pack Includes 2 Valves And 6 Membranes Compatible With Swing, Mini Electric And Harmony Breast Pumps By Medela Breast Pump Spare Part Accessories: This Set Contains Extras For Your Medela Breast Pump To Keep It Running As It Should, Allowing You To Easily Feed Your Baby With Expressed Milk At Any Time Assembly Step 1: Push The Membrane Onto The Valve Until It Engages Assembly Step 2: Push The Valve Head And Membrane Onto The Connector Laterally Items Delivered: 1 X Set Of Medela Breast Pump Replacement Parts With 2 X Valves And 6 X Membranes Compatible With Medela Swing, Mini Electric And Harmony Breast Pumps