Backflow Reference Manual - Mueller

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4", 6", 8", 10"


This assembly is a reduced pressure assembly. This unit was produced from approximately 1975-1989. The assembly has a cast iron check body. The relief valve is a double diaphragm design with a bronze body. All seats are replaceable. A seat removal tool is needed to replace the check seats. The check springs are contained when the cover is removed. The check body was coated with a painted epoxy to inhibit rust. The relief valve utilized an internal relief valve sensing line. The relief valve could be removed from the check body. The serial number is needed to order some repair parts.


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.