I purchased my Spa from Colorado Custom Spas in Denver. Great Spa with exception of the original jets. They started to pop out after about 6 months. They are made by Waterway Plastics. The dealer replaced most of them early, but the replacements were mostly just like the original jets.
However, I noticed the small jets had a different looking material and a different design of the retainer tabs.
I finally got in touch with a rep at Waterway and he did say the material and design had been changed and sent me a full set of new jets. They have so far been trouble free.
If you have jet problems, contact your dealer or Waterway. Hope you have as good luck as I did getting the jet problem resolved.