Hi, we're sorry to that you had a fit issue causing you to not have a great experience with our Elkay LKQS35BK Polymer 3-1/2" Drain Fitting with Removable Basket Strainer and Rubber Stopper. Thank you for letting us know about your experience. It is our priority to ensure customer satisfaction. Please contact our Customer Care department by phone at 800-476-4106 or email at productsolutions@elkay.com as we would like to discuss the matter in more detail.