Waterway 1" Notched Air Control [1-5/8" HS, 2-3/4" FD] [Grey] (660-3577) essexgroup supporting the intended massage effect

supporting the intended massage effect and spa experience

The simplified P1 and Light layout gives this overlay practical value because replacement overlays work best when the button labeling matches the exact function mix of the topside panel underneath

Helps provide manual shutoff and flow isolation

making them one of the most important service parts in restoring proper water heating

Waterway 1" Notched Air Control [1-5/8" HS, 2-3/4" FD] [Grey] (660-3577) essexgroup supporting the intended massage effectThe Waterway 660 3577 notched air control is designed for compatible spa air systems and uses a 1 5 8 inch hole size with a 2 3 4 inch face diameter in grey. This type of control helps regulate the air introduced into the spa system, which can influence how the jets feel and how the overall hydrotherapy experience is tuned. The grey finish makes it a strong match for spas with cooler toned shells or trim, and the notched design supports compatibility