The second Check Valve did not Hold and there were periodic discharge through the relief valve. The Cause is a broken seat and worn out discs on the check valve.
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Buy Wilkins: RK-114-950XLR - 1 1/4"-2" Rubber Repair Kit for 950, DC
Buy Wilkins: RK114-975XLSK 1 1/4"-2" Seat Kit for 975XL RP
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Backflow Preventers are Designed to be REPAIRED, Not Replaced.