Hayward VL Series O-Ring (VLX4004A) cgairsystems The Waterway 660-3580 top access

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

or line access may be necessary

or has become unreliable under load

has become inconsistent

O-ring kit for compatible Challenger pump applications

Hayward VL Series O-Ring (VLX4004A) cgairsystems The Waterway 660-3580 top accessThe Hayward O ring is designed for compatible VL Series applications where a key sealing point needs dependable replacement. An O ring like this is useful because it helps maintain a cleaner seal between joined components, supporting more reliable equipment performance and stronger assembly integrity. This replacement is especially useful when the original O ring is flattened, brittle, cracked, or leaking. Replacing it can help restore the condition