BEST-IN-CLASS: Make use of the American Standard Hand Shower Vacuum Breaker to prevent water from a handheld personal shower from flowing back into the clean water supply PERFORMANCE: The American Standard Vacuum Breaker attaches between a supply outlet and a hand shower hose (both sold separately) for optimal performance COMPATIBILITY: The NPT in-line vacuum breaker by American Standard is compatible with all hand showers SUPERIOR CONSTRUCTION: Vacuum breaker features durable brass construction that is ideal for prolonged contact with water INCLUDES: vacuum breaker (1/2 in.); limited lifetime warranty, function and finish