American Standard In-line Vacuum Breaker for Hand Shower, Matte Black

To prevent water from a handheld personal shower from flowing back into the clean water supply, simply install an in-line vacuum breaker between your wall supply and flexible shower hose. Installs between any wall supply and flexible hose on hand-held shower. Prevents back flow of water into supply piping (May be required by code in some states). Compatible with all Personal Showers, Limited Lifetime Warranty.