The number 660-3577 identifies the Waterway 1" Notched Top Access Air Control Valve, a highly common component in the spa industry. This valve controls the amount of air that mixes with the water in the jets, enhancing the massage pressure.
As a primary OEM supplier, Waterway's part is used by numerous spa manufacturers.
Spa Manufacturers and Brands Using the Waterway 660-3577
Here is a list of manufacturers known to incorporate this specific air control valve into their hot tubs:
Cal Spas
Coleman Spas
Coast Spas
Dynasty Spas (Waterway manufactures this specific air control for Dynasty)
Emerald Spas
Great Lakes Spas
Master Spas
Nordic Hot Tubs
QCA Spas
Strong Spas
Thermo Spas
Vita Spas
Technical Cross-References
The 660-3577 part number replaces or is compatible with several others and has specific dimensions: