Being a mom is hard, washing pump parts shouldn't be, Binks n Things wearable breast pump replacement parts will save you time and energy. Instead of constantly washing your pump parts, this replacement set will allow you to have spare pump parts ready to go. A strong seal provides optimal suction and reduces the possibility of milk leakage. This set fits all Mumgaroo, Mommed, Besrey, Deeteck, Tsrete and other similar S21 model wearable pumps. The self-supporting design allows you to place it on the table after use without worrying about the pump tipping over. Service life of parts As recommended with all pump parts, the service life of a duckbill valve is about 2 months. The service life of a diaphragm is about 4 months. The service life of a flange is about 6 months.