Lots of spas over the years including Vita Spas Master Spas Maax Spas to name a few.
Fits Hole Size:
Push fit with 2 x plastic lugs
Diameter of face: 65mm Height: 103mm Diameter of rear nozzle: 23mm
Push evenly on the rear of the jet fitting to assemble. WARNING: the likely hood is that you may end up breaking one or two before getting one to fit correctly so it’s often worth buying an extra one just in case.