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Backflow Reference Manual - Backflow Direct

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Deringer 40 / 40X RP


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


This is a reduced pressure assembly. Production began in 2014. The assembly has a stainless steel body with an integral shut-off. There is a single access bolted cover for the two checks. The checks are a modular noryl plastic design that utilizes a dual poppet and hinged action. The check discs are made of silicon. The checks are held in the body by bolts that extend to the outside of the body. These allen head bolts must be unscrewed to remove the check assemblies. The checks use a torsion spring design. Spring tension does not need to be removed to change the check disc. The relief valve screws onto the check body and uses an external relief valve sensing line. The relief valve uses a rolling diaphragm design and silicone disc.


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.