ZCL | Xerxes is a leading innovator in composite tank engineering, with nearly 40 years of direct industry experience. We manufacture underground and aboveground fiberglass tanks for fuel and diesel exhaust fluid storage, water and wastewater applications like fire protection and grease interceptors, and oil and gas applications including sump tanks and flare knockout drums. Our six UL-listed or ULC-listed manufacturing facilities across North America ensure that no matter where an installation is, ZCL | Xerxes is able to provide the right tank in a timely manner.