Abstract: A removable bladder assembly for insertion into the core of a roll support sleeve having roll gripping lugs radially displaced by the bladder assembly includes an outer flexible bladder tube and an inner rigid tube for supporting the outer tube. A coupling member is secured to the tubes at each of the tube ends to seal and clamp the tubes together. The member includes a nut axially threaded to the inner tube bore and having an outwardly extending flange. A T-shaped cap has a section over the outer tube and a section over the nut flange. The cap has a flange depending from between the sections and located between the nut flange and the ends of the two tubes. An O-ring and washer like ring are in a rigid tube recess between the rigid tube end and the cap flange. An annular wedge shaped recess is in the cap section overlying the outer tube radially aligned with the O-ring.