Petroleum Containment manufactures the most watertight secondary containment sumps in the industry. We offer an extensive lin ... e of fiberglass UST tank sumps, dispenser sumps, and transition sumps, and penetration fittings. All of our UST piping sumps utilize a patented "Twist-Lok" access cover to ensure a watertight seal while providing quick and easy access. We also have a complete line of dispenser sumps for almost every make and model dispenser on the market. read more