You will find here the Gunite range from Waterway for your concrete spa project. Note that all the series have thread-in jets. The Mini Storm, Poly Storm, Power Storm and Poly Jet old style thread-in massage jets are available.
Be careful, the massage jet series are not interchangeable with each other.
Important for your project implementation
For concrete tanks, the jet must be placed at 22 cm at most below the water level. For the venturi system, you will need 7 to 10 cm maximum between the end of the injector (tube in the passage) and the jet. You can therefore cut the wall feedthrough to the desired length for better venturi suction.