Richard wrote:

There seems to be simillar fittings at
https://www.lsengineers.co.uk/water-...washer-spares/
petrol-diesel-pressure-washer-spares.html

I've bought custom hoses from Q-washers on eBay, they have a variety of
coupler types, if you can identify from what you need ...

http://stores.ebay.co.uk/qwashers/COUPLINGS-/_i.html?_fsub=1288868013