The DFT® Excalibur® NAB (Nickel-Aluminum Bronze) Silent Check Valve is a spring-assisted, nozzle style, non-slam check valve that is designed to withstand the harsh environments of salt and brackish water applications where corrosion resistance and marine life deterrents are a must. DFT®'s center guided check valves provide reliable, low-maintenance service and solve the problems associated with water hammer and severe applications and environments. Contact DFT for more information