PVC Interstitial Float Switches

Underground storage tanks (USTs) must be replaced periodically for safety reasons. Spills, leaks, and fires are real risks, and even a minor leak can cause significant harm to people, property, and the environment. Steel tanks are particularly prone to corrosion. Therefore, the EPA closely regulates the installation, maintenance, and replacement of approximately 544,000 USTs nationwide.

According to EPA regulations, hazardous substances USTs must have secondary containment and must use interstitial monitoring for leak detection. Interstitial monitoring can indicate the presence of a leak in the confined space between the first and the second wall. Madison’s interstitial switch is designed for this very application.



Our Interstitial Switch is a thin profile device for double-wall tanks and pipes. The 3/8” high switch is ideal for underground tanks and piping where the double-wall construction needs to be monitored for product release from the inner tank.