Replacement Parts for Medela Harmony Manual Pump; 4 O-rings, 2 Membranes by Maymom Review August 11, 2018 MarblePiglet No Comments Breast Pumps Replacement O-ring for your Medela Harmony pump plus two membranes BPA free 4 o-rings and 2 membranes › See more product details More Post navigation ← Bebe au Lait Premium Cotton Nursing Cover, Calypso ReviewLansinoh – Stay Dry Disposable Nursing Pads for Leak-Proof Coverage – 100 ct (2-Pack) Review →