Backflow Reference Manual - Wilkins

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450STDA / 450STDAV / 450STDAR / 450STDARV



This is a double check detector sssembly. The mainline assembly is similar to the model 450ST and the by-pass is similar to the model 950XLD. This assembly utilizes a type 1 by-pass assembly. Production began in 2018. The body is stainless steel and configured in an angle pattern. The normal installation orientation in the STDA models allows water to come up from the bottom and then go through two 90 degree turns and goes into a downward flow. This is commonly called a N pattern installation. The STDAV model allows for a vertical orientation. This can happen when the downside 2nd check body is rotated 180 degrees. This allows the flow of water to come up from the inlet check and then rotate the outlet so it goes into an upward flow. The STDAR model has a spool placed between the two check bodies making an adjustable center to center dimension. This allows for a retrofit installation. The rubber repair parts are the same in all of the 450DA model versions.


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.