A Reliance Pump Tank is a must for any home that uses a pump to draw water from a well. It ensures that your pump will run for at least one minute each time it cycles, as required by pump manufacturers It stores a supplemental water supply between pump cycles, to reduce the number of cycles throughout the day, and helps prolong pump life It helps maintain water pressure within your system, ensuring proper operation of your dishwasher and washing machine, and robust flow for showering and bathing. A properly sized pump and pump tank will work as a team to meet your needs and will deliver many years of dependable service. PRE-PRESSURIZED DIAPHRAGM TANKS Strong, flexible butyl diaphragm, powder-coated inner shell for permanent separation of air and water In-line models from 2 through 14 gallons, designed for installation directly into the cold water line Free-standing models from 14 through 119 gallons