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Spas and Spa Bath Air Injectors or Air Jets
All barbed air injectors (with the exception of Senex, In-Spa-Ration, and Waterway Button) are plumbed with 9mm / 3/8" tubing.
Senex and In-Spa-Ration injectors utilise 12mm / 1/2" tubing and Waterway Button utilises 6mm / 1/4" tubing.