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Mend Watts 9D-M3-1/2

watts Model - 9D-M3-1/2'' backflow preventer?

I replaced the leaking backflow valve twice this month and each one leaked after installation.Any idea's what could be
wrong? The original valve lasted 10 yrs. before leaking.

john balles
September 2007
WattsWatts 9D-M3-1/2''Heating, Home Heating SystemsLeaking Valve Month
Water line had dirt in it from installation of new feed supply.
Flushed line, cleaned valve,reinstalled valve and OK now not
leaking

john balles
October 2007

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