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 Waterways 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 Poly Storm series of jets used by many manufacturers, including Spaform, Beachcomber and Somethy/Aquamarine.
Diameter: 55 mm
Length: 90 mm
The compatible Poly Storm jets generally have a part number in the 212-8XXX format.