Flotec In-Line Pre-Charged Water System Tank - 15 Gallon Capacity, Model# FP7100 In-line design Pump mounting bracket not included; pre-charged pressure not applicable Drawdown, Gallons@PSI: 20/40 PSI--2.2@20/40 PSI 30/50 PSI--1.8@30/50 PSI Discharge Size 3/4in.