Amtrol® invented the first pre-pressurized well tank over 50 years ago as a better solution to traditional air-over-water tanks. This revolutionary product featured an innovative design that uses a hoop ring and groove to lock the diaphragm, liner and shell together. Today, Well-X-Trol® is still the standard of the industry with many unique features including high strength steel to deliver 150 PSIG working pressure, patented Turbulator™ water circulator device and antimicrobial liner that neutralizes bacteria on contact. Well-X-Trol® is the world's most trusted brand of well tanks, backed by an industry leading 7-year limited warranty.