Pigeon Breast Pump Mother Assist Electric Purchased 6 years ago. I used it 6 years ago and again this year, but I'm selling it now because I don't use it anymore. The frequency of use wasn't high, but since the raw materials for everything except the electric part and adapter are polypropylene and silicone rubber, there may be some deterioration compared to new ones. I'm selling it because I thought it could still be used, but it's used, so please refrain from purchasing if you are concerned about this. I will sterilize it before shipping, but please sterilize it again before use. Two silicone valves are unused, but they were purchased 6 years ago.