Two sizes, both featuring an O-Ring sealed, greaseless flange with 6517 Quick Release Clamp. Top flange is ground flat, bottom mating flange has an O-Ring groove for a CAPFE O-Ring (PTFE encapsulated silicone), held tightly together via a quick release clamp. Size 60 is 200mm high x 60mm I.D.; uses 6517-22 Clamp and 7855-878 CAPFE O-Ring. Size 152 is 250mm high x 152mm I.D.; uses 6517-27 Clamp and 7855-881 CAPFE O-Ring. Complete item consists of Outer Body, Inner Top, CAPFE O-Ring and Quick Release Clamp.