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Design
                attached protrusions to receive two-sided loose flanges 
                        
                bellows with multiple corrugations, multiple walls depending on nominal diameter and pressure rating 
                        
                bellows with multiple corrugations, with stainless steel outer reinforcing rings 
                        
                loose flanges on both sides 
                        
                PTFE formed flange with loose flanges on both sides 
                        
                single corrugation bellows with steel, nylon or aramid pressure carrier inserts 
                        
                welding ends on both sides