The high temperatures and chlorine in your hot tub can fatigue the plastic clip which holds the spa jet in place. If you are having trouble with your Waterway Cluster Storm thread-in jets popping out, this may be the solution. Remove the diffuser from the back of the jet and replace it.
This diffuser fits the Waterway Cluster Storm series of jets used by many manufacturers.
Diameter : 24 mm
Length : 64 mm