The Waterway 660-3580 top access air control features a 5-scalloped style design for compatible spa air systems that need convenient top-side airflow adjustment. Air controls in this category allow the user to fine-tune the amount of air entering the jet system, helping tailor the hydrotherapy feel to personal preference.The top access format is especially useful because it keeps adjustment simple from inside the spa, while the scalloped styling gives the control a more distinctive finished appearance. When a control becomes worn, difficult to turn, or visually dated, replacing it with the correct Waterway component can improve both function and overall spa presentation.This Waterway air control is a practical upgrade and replacement choice for spas that need dependable airflow adjustment with a more finished, premium surface detail. Waterway top access air control 5-scalloped style design Designed for compatible spa air control systems Helps adjust incoming air for a customized jet feel Useful for restoring function and upgrading appearance