Spent an hour with my engineer friend Brian yesterday afternoon and learnt something more about this plug or take off fitting,Brian confirmed we had the correct thread gauge reading 7/16 BSW but he then cross referenced this to a table of thread sizes, checked the measurements and said that the fitting was actually 5/8 BSF and to prove the point actually made one which fitted perfectly. Even he admits he gets caught out sometimes so no hope for the likes of me!
Geoff.
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