Waterway Mini jets AKA "neck jets" are a specialty, small size jet. Standard face diameter for these waterway spa jets are 2.5-3". These jets are available in directional as well as a rotating variety. These are different from many of the larger style Waterway jets in that they do not have a "stem" or "diffuser" These spa jets have 4 tabs that you push into place, or a simple threaded back.
These jets have been used since prior to 2000 and are still being used today. Most of the jets below will be shown in gray, but may be available in more colors. Just choose a jet to see what color it is available in.