Backflow Reference Manual - Backflow Direct

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Deringer 20X / 30X / GX


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


This is a double check detector assembly. Production began in 2014 on the models 30 & 30X while production on the 30G began in 2018. The model 30 & 30X come with grooved end integral butterfly shut offs while the 30G comes with OSY flanged end shut offs. The bypass is a type 2 design with a single check piped around the mainline second check.


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.