??? 1/2" 9D-M3 Dual Check Valve Backflow Preventer with Intermediate Atmospheric Vent, Brass backflow preventer Female Union Inlet and Outlet Connections, 190T012, Replacement for Watts

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• 【Premium Brass Construction】Watts 1/2" 9D-M3 Brass Backflow Preventer Constructed with heavy-duty brass, features a brass body, stainless steel working components, an integrated filter, and durable rubber discs. Its superior corrosion resistance ensures decades of reliable service, delivering 3x the lifespan of standard valves. The precision-engineered dual check mechanism maintains leak-free performance even under frequent pressure fluctuations
• 【Consistent Performance】9D-M3 Brass Backflow Preventer are suitable for hot or cold water and can be used under continuous pressure. Stable operation within a temperature range of 33 ° F (antifreeze) to 210 ° F (boiling water resistance). The maximum working pressure is 175psi (12.1 bar) and has undergone over 5000 pressure cycle tests. The minimum required pressure is 25 psi (1.7 bar). Fault safety and reliability under extreme temperature and pressure environments
• 【Multi-Functionality】Watts 1/2 in Dual Check Valve is designed for smaller supply lines, making it ideal for laboratory equipment, processing tanks, sterilizers, dairy systems, and similar applications. It is particularly recommended for boiler feed lines to prevent backflow when the supply pressure falls below system pressure. Compatible with all major brands
• 【Installation Instructions】1/2" 9D-M3 Brass Backflow Preventer supports both vertical and horizontal installation for flexible application. Important: To prevent water damage during valve operation, a drain line (terminating at least 12 inches above the floor drain) must be installed. When used with boilers, avoid direct surface gap connections - this safety measure prevents scalding risks and ensures uninterrupted vent opening functionality
• 【After-sales Service】We provide 24/7 after-sales service for your Watts 9D-M3 Brass Backflow Preventer. If you encounter any issues, we will assist you with a return or exchange according to Amazon's return and exchange policies. Your satisfaction is essential to us, and we strive to ensure that you have a smooth and reliable shopping experience