The Waterway 660-3567 top access silent air control is designed for compatible spa air systems that use a 1-5/8 inch hole size and a 2-9/16 inch face diameter. This silent-style control helps regulate incoming air at the spa surface while offering a more refined operating feel for users who want adjustable airflow without sacrificing a polished presentation.Its gray finish makes it especially appealing in spas with cooler shell tones or coordinated gray accents, and the scalloped styling gives the control a more finished decorative look. When an existing control becomes difficult to turn, cracked, or visually tired, replacing it with the correct Waterway part can noticeably improve the spa’s feel and appearance.This Waterway air control is a strong choice for compatible spa systems that need dependable airflow adjustment with a clean, premium finish. Waterway top access silent air control Fits 1-5/8 inch hole size with 2-9/16 inch face diameter Gray scalloped design Helps regulate airflow in compatible spa systems Useful for restoring premium control feel and appearance