| Alan, Mine is a bit different but they all incorporate the same principle i.e. you should be able to replace the glass in place without having to disturb the fittings.
Firstly slacken off and remove both compression nuts, then you remove the nut from the top of the top fitting and then slide the glass tube through the top fitting, slide the rubbers and compression nuts on the tube as you slide it through then drop it into the lower fitting. Assemble and tighten the glands and refit the top nut.
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