Description
The Watts B911S Combo Back Flow Preventer & Pressure Reducing Valve is a dual-function unit that supplies make-up water while preventing reverse flow, maintaining proper pressure levels within HVAC systems. Built with a 1/2″ sweat connection and operating within a 10 to 25 PSI adjustment range, it regulates incoming water through an internal pressure control mechanism while a dual check assembly stops backflow. Rated for up to 212°F and 100 PSI, it supports boiler feed operations in hydronic heating equipment. Mounted along the feed water line, it is soldered and threaded into place during setup.
