Q. "What are check valves?"
A.Check valves prevent the back flow and cross flow of water. With a check valve water can only flow one direction. Check valves are recommended to prevent by-pass when a Thermixer is installed with a downstream shut-off device.
Q. "What are screwdriver stops?"
A.With stops, it means the valve has shut-offs for the water line so you don't have to shut off water to the entire house to work/repair parts on the shower/tub system.
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