There are o rings there that dry out and cause the leak. You need to take the whole fitting out by screwing it out and just replace the O ring - BUT there is a an adjustable seat in the fitting - take note of its position in case you move it but try not to move it.
It has been 5 years since I did mine so I cannot remember the specific details - takes about 5 minutes. Hopefully someone with updated experience will come along and give details.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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