Gerni pressure washer solid brass screwed coupling for lances and adjustable nozzles. See it at the top right on the lance in the third picture.
It's for 1/4" lance that screws into a 1/2" fitting
This is OLD obsolete stock and is sold "as is" and the purchase is the buyers responsibility to ensure it's correct for what they want to use it on. No refunds. no warranty.
At the moment standard postage within Australia, is capped at a maximum of $25, so maximise the saving on postage and buy something in related items below!