Duo Blaster Roto Ozone Jet II

This rotating jet from Balboa HydroAir's Duo Blaster range was also called "Ozone Jet II". It screws through the spa shell into a Duo Blaster socket.

Dimensions
Visible face diameter: 38 mm
Height: 24 mm
Thread : 23 mm

References
Balboa HydroAir: 16-2672