Reliance Free-Standing Pump Tank. Diaphragm pump tanks for dependable protection of jet or submersible well pump. Ensures that pump will run for at least one minute each time it cycles as required by pump manufacturers. Stores a supplemental water supply between pump cycles to reduce the number of cycles throughout the day and helps prolong pump life. Helps maintain water pressure within system ensuring proper operation of dishwasher and washing machine and robust flow for showering and bathing. Steel shell with powder-coated exterior to maximize corrosion resistance. Metal air charge valve is conveniently located and resistant to mechanical damage. Strong butyl rubber parabolic diaphragm delivers dependable service. Powder-coated inner shell protects the water reservoir.