PREVENTS BACKFLOW OF WATER — From a handheld shower head into the water supply. 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. MINIMAL PRESSURE LOSS — Less than 5 psi. Solid brass housing. Standard 1/2-Inch NPS connections. CONNECTS — Between the water supply and handheld shower hose. NO TEFLON TAPE REQUIRED. RUBBER WASHERS INCLUDED — To seal both ends of the vacuum breaker. Replace existing shower hose washer with washer supplied by High Sierra. IMPORTANT: Failure to use the included washers may result in shower head pressure loss. Engineered and assembled in the USA with imported components. Available in 6 beautiful finishes. 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.