If you do happen to misplace your one way valve or find that it has been damaged in some way, there is no need to panic. You can contact our customer service department and we will get a replacement shipped out straight away! In the meantime, you should continue using your Chimney Balloon as normal without an airtight seal. It’s important that you note this though: once you have replaced the one-way valve, you must allow 24 hours for it to reach its full airtight seal.