{TAIL ~ An improved, durable seal} of folded seam connections is achieved by a flange like double fold which is arranged at a first pipe end and which is surrounded on {HEAD ~ the outside} at least in part with positive locking and with a continuous metal seal, by a second double fold at the second pipe end 
{ TAIL ~ An improved , durable seal } of folded seam connections is achieved by a flange like double fold which is arranged at a first pipe end and which is surrounded on { HEAD ~ the outside } at least in part with positive locking and with a continuous metal seal , by a second double fold at the second pipe end
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