This large tank will smooth flow from faucets and shower, reducing pump cycling and eliminating pulsations and water hammer. Water is totally separated from air chamber and metal tank by a bladder and polypropylene tank liner. Mounts horizontally, vertically, or upside down. Includes brackets and band clamps. Pre-pressurized to 20 psi. Tank may be fine tuned to cut-in pressure of pump. Internal bladder. NSF-61 listed for all water applications.