The other pieces that you’ll need for your Medela Breast Pump parts are the valves and membranes. The membranes attach to the valve and function to facilitate the suction on your breastpump. This is probably one of the pieces that gets worn out the easiest, as well as one of the pieces that gets the moldiest. Fortunately they are one of the least expensive accessories to replace. You can purchase the valves and membranes together or separately, depending on what you need. Similar to the Medela Breast Pump tubing, this is another option that is available from Medela or from other retailers. I have personally used both and was not able to experience any difference so for me, the cost savings was beneficial. Here are your options when it comes to valves and membranes.
Medela pump tubing for the Medela Lactina Breast Pump and Medela Classic Breastpump. This style tube has one two tone yellow end that is round in shape, and one end with a cream colored adapter. This is the tube that is currently included in Lactina Double Pump Kits.