A plug for sealing tubes of shell and tube heat exchangers, said plug (12) comprising: a tie rod (30); a spacer (20) of said tie rod (30); a gasket (51) set between said tie rod (30) and said spacer (20); means (50) for drawing back said tie rod (30); said tie rod (30) comprises, at a first end thereof, a threaded portion (31); said tie rod (30) comprises a second tapered end (33) thereof having a diameter larger than the diameter of said tie rod (30).
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