Watts Brass & Tubular #9D-M3 1/2 1/2" Backflow Preventer
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<b>[Product Information]</b><br>
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<li>1/2" female pipe thread union inlet x 1/2" female pipe thread union outlet</li>
<li>With intermediate atmospheric vent</li>
<li>Typically installed on boiler feed lines to prevent backflow caused by back siphonage or back pressure</li>
<li>For systems without antifreeze</li>
<li>Rust inhibitors or other chemicals which will contaminate the potable water system</li>
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