Backflow Reference Manual - Beeco/Hersey

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Hersey DDC II


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


This is a double check detector assembly. Production was begun approximately in 1975 and was discontinued in 2004. It utilizes an assembly similar to the Hersey model 2 for the main unit. The model FDC 3/4" is used on the bypass. In 1988 the end to end dimension of the main body on the 3" and 4" sizes were changed. The earlier model of the 3" was 5/8" shorter. The earlier model of the 4" was 1" shorter. The rubber repair parts are the same.


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.