Take the old one out and try the shower without a seal. Our seal was torn soon after we bought the Flagstaff and after trying the dealer I found one at Lowe’s. When it also tore I took it off and we used the shower for over 2 years with no leaks.
2019 Ford F-350 Super Duty CC Dually 6.7 Diesel
2011 Cedar Creek 36CKTS Touring Edition
I Catch Fish......What is your SuperPower?