All of our Keurig replacement parts are tested and operated in fully assembled machines with cleaning vinegar, then operated again with filtered water. They are ready to install and proper operation is verified through many brewing cycles. We invest time and care into only offering high quality clean replacement parts for our customers. Stop by and check out our other items in our store, TN_Goodies. All items are thoroughly tested and exact condition is always described. We are working full time to serve our CUSTOMERS! Please do not hesitate to send a message with any questions, we are here to help. Thank You for shopping with us!