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Backflow Reference Manual - Backflow Direct

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Deringer 20 / 20X DC


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


This is a double check assembly. Production began in 2014. The body is stainless steel with a single bolted access cover. The shut-off valves are an integral butterfly design. The checks are a noryl plastic modular design with a dual action check movement encompassing both poppet and a 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 have to be unscrewed to remove the check assemblies. The checks use a torsion spring design. Spring tension does not need to be released to change the check 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.