If replacing one suction cover, it is highly recommended that you replace all of them to be compliant. These suction covers are available for replacement of your older suction covers (spa models pre-2009). There is however no guarantee that these suction covers will fit your pre-2009 spa.
Has the ball in your air control become stuck, or has it started to “whistle?” It is most likely time to replace it. Master Spa Parts has the perfect replacement part for you. The 1-Inch, MG Air Control w/ Blower Assist Tee is compatible with spas and hot tubs that accept a one-inch air control.