We had this with a plastic connection and bought a new brass set. Not much help with correcting the one you've got, maybe someone else will be able to help.
Plumbers tape has not worked because the water forces its way out where the connection is made. I know such a connector does exist but have forgotten its name.
Have you got a photo of the set up you have, BML? That might help with advice Most of the new hose fittings are also available in two sizes. Is there a chance you have the wrong size?
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I have tried all sorts of connectors and hoses, with and without plumber’s tape, but the only ones I find don’t leak and can take the high pressure of my garden tap are Gardena.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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The brass ones are more durable, but they leak without it too, in my experience.
I live in west central Scotland - not where that photo is...
Do you mean this connector.
Wickes Universal Garden Hose Pipe Tap - Connector.
Sorry picture won't load and now it's gone to large bark print, Sorry not shouting.
Have you got a photo of the set up you have, BML? That might help with advice
Most of the new hose fittings are also available in two sizes. Is there a chance you have the wrong size?
I live in west central Scotland - not where that photo is...