![ASSE—1056—SVB](https://backflow.com/wp-content/uploads/sites/15/2019/06/ASSE-1056-SVB.png)
The SVB is similar to the PVB, however it is designed to be spill-resistant for indoor use. Like the PVB, the SVB is designed to protect against backsiphonage and is not to be subjected to backpressure. Typically, the SVB is installed on chem-soap dispensers, x-ray supply lines or tank fills.