Will smooth flow from faucets and shower, reducing pump cycling and eliminating pulsations and water hammer. Water is totally separated from air chamber by a diaphragm and polypropylene tank liner. Mounts horizontally, vertically or even upside down. May be fine tuned to cut-in pressure of pump. Port: 3/4″ NPT (male). Diameter 8″, height 12-5/8″. Pre-pressurized to 20 PSI. Maximum working pressure 100 PSI. Includes brackets and band clamps. 2 gallon.