Their semiclear, .04" polymer fiberglass construction allows 90% light transmission—making them perfect for algal culture. An integrated, skirted stand supports the tank and requires no assembly. Conical base slopes from 45° to 30° at bottom. An access port is cut out for the 2" NPT elbow located at the bottom of the tank. Reinforced bottom and top edges prevent cracking and breakage. All tanks ship completely assembled and include 2" NPT bottom fittings. Special sizes available, please inquire. Ship motor freight directly from the manufacturer.