High quality seal. I originally installed it in November. 2014 as a stopgap until spring when I planned to replace it with an RTV seal. It's been doing its job for a long time, never leaking. Why bother replacing it only to use RTV instead? Overall it took a lot longer than I expected. Update: June 2018, approx. 60,000 miles on seals. No leaks so far and it's holding up!