After reading the write up for that Mark, i would say its a one time use only, and would have to be replaced again at next belt change.
Quote:
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NOTE: Please be advised that the hydraulic tensioner comes with the pulling pin shown in the picture above. Once the pin is pulled off, the hydraulic tensioner will be automatically locked and no longer can be used.
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So when the belt is next changed and the tension removed, the piston will travel past some sort of non-return latch

.. dont know if this is due to the the company that copied it, or if the seller does not realise the piston can be compressed in a vice, or in my case, a valve spring compressor
But hey .. at that sort of money, £28, its cheap as chips... another reason why people should be checking out ebay across the pond.
Paul.