Backflow Reference Manual - Ames

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2 1/2", 3", 4", 6", 8", 10"


This is a reduced pressure principle assembly. Production began in 1998 and was discontinued in 2007. The Ames Company was purchased by Watts Regulator Company in 1997. Ames began marketing the Watts 909 as the Ames 4000CIV. For breakdown information see Watts 909. The body is constructed of fused epoxy cast iron. The check springs are contained when the covers are removed. The check seats are replaceable. The relief valve utilizes an external relief valve sensing line. The relief valve spring is contained when the relief valve cover is removed. The relief valve seat is replaceable.


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.