{HEAD ~ An improved, durable seal} of folded seam connections is achieved by {TAIL ~ a flange} like double fold which is arranged at a first pipe end and which is surrounded on 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 
is achieved by
{ HEAD ~ An improved , durable seal } of folded seam connections is achieved by { TAIL ~ a flange } like double fold which is arranged at a first pipe end and which is surrounded on 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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