Backflow Reference Manual - Ames

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4000B / 4000B M3


1/2", 3/4", 1", 1 1/4", 1 1/2", 2"


This is a reduced pressure assembly. In 1997 the Ames Company was bought by the Watts Regulator Company. Ames began to market the Watts 009 series as the Ames 4000B series. For breakdown information see Watts Model 009. The external appearances may be different but the internal parts are the same. The 4000B has a bronze body with an in-line modular check design. The unit utilizes a single access cover for the check and relief valve components. The check modules are plastic and held in the body by a retainer which is placed in from the top. The relief valve stem sits in the middle of the retainer between the two checks. All seats are replaceable. Check springs are contained when the cover is removed but not the relief valve spring. The spring tension has to be released from the check modules for a proper repair.


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.