PREVENTS BACKFLOW OF WATER — From a handheld shower head into the potable water supply. Minimal pressure loss, less than 5 psi; maintains optimal shower performance without compromising flow. Ideal for institutional, hospitality, residential use, and anywhere required by local plumbing codes. ASSE 1014-2020 PLUMBING STANDARD — Compliant, tested, and Certified. MASSACHUSETTS Uniform State Plumbing Code (248 CMR 10.00) approved. RUBBER WASHERS INCLUDED — To seal both ends of the vacuum breaker. IMPORTANT: Failure to use the included washers may result in shower head pressure loss... PLEASE contact High Sierra if you need assistance. SOLID LEAD-FREE BRASS CONSTRUCTION — Toxin free, corrosion resistant, and extremely durable for a long life. Built to last! CONNECTS — Between the water supply and handheld shower hose. Standard 1/2-Inch NPS connections. NO TEFLON TAPE REQUIRED! FACTORY DIRECT — Engineered and assembled in the USA with imported components. Available in 6 beautiful finishes. Have a Question? Talk to our U.S. Based factory experts by phone or email. High Sierra's solid metal vacuum breaker and backflow preventer is a crucial safety component for any handheld shower system. Engineered to prevent contaminated water from reversing into your home's water supply, this compact yet effective device is certified and compliant with national plumbing standards. It provides peace of mind for residential, commercial, and healthcare installations. Crafted from corrosion-resistant solid brass with 1/2-Inch NPS threads, it's compatible with all standard shower hoses and water supply connections. Its precision-engineered internal check valve ensures reliable backflow protection with minimal pressure loss. Included rubber washers ensure fast, leak-free installation. Whether upgrading an existing shower or equipping a new one, the High Sierra vacuum breaker is a vital accessory for water safety and code compliance, without compromising performance or aesthetics. It prevents backflow, is certified compliant with relevant standards, features solid brass construction, standard connections, minimal pressure loss, and is ideal for various uses. Rubber washers are included, and it's engineered and assembled in the USA with imported components, available in six durable finishes.