Arag Trijet Nozzle Holder 3 Way Hinged Clamp
They have a 10mm spigot, and operating pressures upto 12 Bar -174 Psi
They can also be shut off individually if turned to mid position between nozzle settings.
NB:- The top clamp and screws are not shown in the images, but are included with each nozzle holder assembly
Parts Diagram Here