Why did the style change for the bladder bushing?

Many applications being used contain liquid when vacuum sealing inside the chamber. We always recommend that an angel tray kit for liquids is used. 

To assist in keeping these liquids from entering the bladder, we have added 2 "O" Rings to the bushing. 

These "O" Rings serve as a gasket to help protect the bladder. A photo of the new style bladder bushing can be found below.