Backflow Reference Manual - Watts

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709 DDC / 709 DCDA


3", 4", 6", 8", 10"


This assembly is a double check detector assembly. Production began approximately in 1979. The model number was changed from DDC to the DCDA designation. The assembly utilizes the 709 design on the main valve and the bypass unit. In 1991 the bypass was changed to the 007M1 model. In 1993 the bypass was changed to the model 007M2. In 1998 the bypass was changed to the 1/2" 007. Be sure to look at the name plate of bypass assembly to be sure which one you have.


Common repair parts are a very small subset of the 10,000 plus items BAVCO stocks. Please feel free to contact us direct at 800-458-3492 for pricing on items not listed or backflow prevention devices.