Wellmate WM-6 / WM0075 QC Captive Air and Retention Fiberglass Tank (20gallon) Quick Connect, Replaceable air cell assures easier field servicing. Greater drawdown than comparably sized steel tanks yields greater efficiency. Extended labor warranty option is available to homeowners. Wont rust in corrosive environments, particularly important in coastal regions. Quicker and less costly to install, usually requiring only one person and fewer man-hours