The Krowne 21-307L ceramic cartridge valve is a high-performance replacement part designed specifically for Royal Series pre-rinse add-on faucets. This 1/4-turn cartridge controls water flow with precision, making it an essential component for commercial kitchen sinks. Its ceramic construction ensures durability, while the built-in check valve helps prevent cross flow, protecting your plumbing system. The black Krowne logo indicator makes installation straightforward, and the fully assembled design simplifies replacement. Ideal for restaurant owners, chefs, and facilities managers, this valve maintains the performance and reliability of Krowne’s Royal Series faucets. With a 3-year limited warranty, you can trust that this part will deliver long-lasting functionality, reducing downtime and maintenance costs in your commercial kitchen. Whether you're upgrading an existing system or replacing a malfunctioning handle, the Krowne 21-307L is a smart choice for maintaining peak operational efficiency.