Backflow Reference Manual - Wilkins

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475STDA / 475STDAV / 475STDAR / 475STDARV



This is a reduced pressure detector assembly. The mainline valve is similar to the Model 475ST. The by-pass assembly is a model similar to the 975XLD. Production began in 2018. The body is stainless steel and configured in an angle pattern. The normal installation orientation in the ST models allows water to come up from the bottom and then goes through two 90 degree turns then goes into a downward flow. This is commonly called a N pattern installation. The STV 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 STR 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 475STDA 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.