Thank you for choosing Aston and the attractive NAUTIS Completely Frameless Shower Door Collection for your remodel. Also - thank you for adhering to professional installation! The vast majority of time, a missing seal is due to it being caught in the protective packaging that gets thrown out. However, we are here to make sure you have the perfect experience! Please email our product support team ASAP support@astonglobalinc.com with your name, model, and HD order information, along with that seal(s) that were missing and we'll take care of you. We hope you enjoy the beautiful design, high quality and functionality of your new NAUTIS Door years to come!