there are 2 seals in the packaging. 1 for our product and the other for the previous manufacturer that Glacier bay had contracted before they started putting our parts if you had the dual flush valve preinstalled in a Glacier Bay toilet. For additional information or help with your product contact Fluidmaster’s Technical Service Department as we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include: Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.