A Reliance Pump Tank is a must for any home that uses a pump to draw water from a well. 0.75-inch male pipe thread connection. Strong, flexible butyl diaphragm, powder-coated inner shell. Permanent separation of air and water. 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.