I went searching and found a few pictures of the nozzle you require but not a manufacturer. To what high pressure washer does this go to? Campbell-Hausfeld?
I did some more searching and found several sites - each with their own brand of high pressure zero angle head. The ones that are zero angle are "red - coded" - try this one. you may need to find your own adapter to make it a quick disconnect. In this case look under McMaster-Carr Industrial supply or MSC industrial supply.
Pressure power washer spray nozzles