Basepump models RB750-AVB, HB1000-AVB, and CB1500-AVB come with factory-installed vacuum breaker backflow preventers. These devices automatically protect your home’s clean water source from cross-contamination with sump pit water. Here’s how they work:
In the unlikely event that, while the Basepump is operating, the municipal water supply suddenly loses pressure and actually begins to suck in reverse (a negative pressure situation), the vacuum breaker automatically opens to the atmosphere (i.e. the air in your basement). This prevents back-siphoning from occurring, because the suction coming from the municipal pipe system would draw in air through the vacuum breaker, rather than sump pit water. The vacuum breaker’s air inlet valve closes when water flows in the normal direction through the Basepump, but when water stops flowing the air inlet valve automatically opens, interrupting a potential back siphon condition.
Most municipal plumbing departments recognize atmospheric vacuum breakers as an effective method of preventing backflow. Check with your local plumbing department for the requirements in your area. As the only ceiling-mounted water powered sump pump on the market, Basepump is actually the only water powered sump pump able to use vacuum breaker backflow preventers.
Please note that, in order for the vacuum breaker to work properly, it is imperative that the Basepump is installed correctly. Follow the pump’s installation instructions, and be sure to discharge any Basepump with a vacuum breaker independently to your home’s exterior (you cannot connect it to your primary sump pump’s discharge).
This article is intended for informational purposes. Before beginning any construction project at your home, please ensure that you take necessary safety precautions and consult construction professionals whenever necessary.