If you want to change these parts in your spa installation, identifying an air control valve or its inner part can be complicated if you don't know the manufacturer of the part. Many brands, especially Chinese, now sell their own models, and all (valves and inner parts) are very similar.
However, each valve is unique, with its own cover model and an inner part adapted to the valve itself.
First of all, check if a reference is written on a part of the valve. Also note its dimensions and connection diameter.
Finally, rely on the thinnest part of the valve interior. It is mainly it that will change shape according to the brand. To make your search easier, we have listed in the photos the most common brands of hot tub air controls: Waterway, LVJ, Rising Dragon, CMP et HydroAir, and the specific shape of their inner part.
Note: Some brands offer the same valve but in different sizes (3/4" or 1" for example). The shape of the inner part will not be affected.
Do not hesitate to contact us if you do not find the air control or the inner part that suits your needs !