Waterway Gunite Jet Nozzle Extension Kit

Waterway Plastics Gunite jet nozzle extension kit - suits Waterway Gunite jet bodies.
Unscrew standard nozzle from the jet body and screw this one in.
Use a length of 15mm (0.5") pressure pipe to suit the required length based on the jet depth from the spa or pool surface.

May suit other brands of concrete jet bodies as well. 
Thread - loosely fits 3/4" FPT threaded faucet fitting - thread has an OD of 24.5mm - likely a 3/4" MPT thread