The 2.5" ferrule is great, however it is actually a 2" diameter pipe ferrule. The catalog description for the ferrule should include the 2" pipe Dia. and the outside dia. of the ferrule @ 2.5". The 2.5" seal and clamp I ordered to go with the ferrule were too large for the ferrule. I had to return the clamp and seal and order a 2" clamp and seal. The fit worked as it should. The return shipping for the returned parts was more than the value of parts. Please clean up your catalog! John