PTFE Bellow seals designed to handle highly corrosive liquids. These seals are outside mounted with simple installation procedure and hence cost effective for corrosive media sealing. This sealdesignated as Fixed & replaceable bellow face respectively. For replaceable version there is flexibility for selection of face material as per the media to sealed, which can be easily removed & replaced & is highly desirable in severe applications. to sealed, which can be easily removed & replaced & is highly desirable in severe applications.