The Mocal sandwich plate uses BSP fittings, someone may have attempted to use an NPT fitting which will work but will get hung up halfway in. If it isn't leaking I would be tempted to leave it.
The fitting you likely need is 1/2" BSP to -10 AN. There is also a high-flow version of the sandwich plate that uses 22mm fittings but I haven't seen anyone use that one yet. Of course this is assuming that it is a Mocal.
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