The Krowne 21-452L Heavy Duty Coupling Flanges with built-in shut-off valves and adjustable centers are a versatile and robust solution for plumbing installations in commercial kitchens and other similar environments. Featuring a 1/2" NPT female inlet, these coupling flanges ensure a secure and reliable connection to various plumbing systems. The inclusion of built-in shut-off valves provides an added layer of convenience, allowing for easy control of water flow without the need for additional components. Notably, the adjustable centers make these coupling flanges adaptable to different installation requirements, enhancing their versatility across multiple faucet configurations. Designed to be compatible with all Royal Series faucets, they also offer interchangeability with most other brands, ensuring wide-ranging applicability across different setups. The package includes two rubber washers, contributing to a secure, leak-proof installation, crucial for maintaining operational efficiency and minimizing downtime. The Krowne 21-452L is an excellent choice for professionals in the hospitality and food service industries, where durability and adaptability are paramount, providing a reliable solution that meets diverse plumbing needs with its thoughtfully engineered features.