Waterway Power Storm jet barrel diffuser. This is the white wine-glass shaped plastic rear on the jet that often perishes over time, especially with the use of Bromine.
It also has the locating lugs attached, which hold the jet barrel in the jet body. These lugs sometimes break off, requiring a replacement diffuser or jet barrel.
Suits all jet barrels in the power storm snap-in style range except Storm II.
These diffusers are very tight and often can be difficult to fit. As a result we generally recommend replacement of the complete jet internal instead. Diffusers broken or damaged whilst trying to fit them are not covered by warranty.