| http://www.w3.org/ns/prov#value | - ar gasket.Advantageously, the driving means of this sealing device of the stuffing box type may consist of a known system comprising a bolt threaded at one end and a clamping nut in screwing engagement with said threaded end.In this case, the annular gasket which may be employed--known per se--is preferably made of a suitable elastomeric material, such as for example the already mentioned silicone
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