Customer Rating: Summary: Replacements 2007-07-02 Comment: I used the Medela Pump with my first child for about 5 months. The membranes were starting to get cracks and it was difficult to take/pull them off because I was afraid that they would come off in pieces. I was relieved to find that it was so easy to order replacements. The replacements arrived promptly, although I wish the shipping was less expensive. As it is, I paid more in shipping than for the membranes. The package contained 6 membranes, so those will last us a while.