Thank you for your question, Matthew! Code permits that stoppers can leak no more than a gallon per hour with 6" of water in the bowl. The seal is provided by the weight of the water holding the rubber seal against the flange and the bowl must have at least 6" of water to provide adequate pressure. Please be sure this is not the issue occurring and if the leak persists, we would recommend checking that the required sealant was used on the flange which should be a uniform 1/4" round bead of sealant. Please contact us directly if you have questions or need further assistance.
Best regards, Edward
Date published: 2019-03-11