Backflow Reference Manual - Febco

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


This was a reduced pressure assembly. It was produced from approximately 1973 to 1978. The original version was the Model 835. It was redesigned by changing the mounting of the relief valve to the bottom of the check body. The 835B design has the relief valve mounted underneath the first check body and can be removed from the check body. It utilizes an external relief valve sensing line. It was a bronze bodied unit. The check covers screwed into the body. The checks are an in-line design similar to the 805. All springs are contained when the covers are removed. Spring tension has to be released for proper repair. Check seats are not replaceable. 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.