A tube block and an assembly consisting of a plurality of parapel tubes 91 connected by a membrane 92, wherein the tube block comprises a) a base section and b) an upper section extending upwardly from the base section A plurality of ridges 3, at least one top surface of spaced ridges defining a generally horizontal plane, at least one spacing of the spacing therebetween, such as a membrane of the assembly sheet, in order to define the channels 4 And the tube block includes means for attaching the tube block to the tube assembly.
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