The Everbilt 2 Pack Brass Anti-Siphon Frost Free Sillcock Valve is a high-quality plumbing fitting designed to prevent water from freezing in outdoor faucets. With a 3/4 inch outlet diameter and 12 inch length, this valve is perfect for cold weather conditions. Made of durable brass material, it features an anti-siphon design and is compliant with California Prop 65. These valves are easy to install and help ensure that your outdoor faucets remain functional even in freezing temperatures.