Double-bottom design for utmost protection against leaks;Visual primary tank monitoring system;Welded lap joint-the strongest one;Standard dimensions of the tank and positioning of the NPT openings for simple and easy retrofit installation;Two large grip handles on both sides for greater ease of manipulation;The handles are recessed and never in the way;Sandblasted and coated with polyurethane, UV-resistant paints;Light color paint finish such that condensation is less likely to occur within the tank;Robust tank leg brackets for greater stability;All tanks are factory pressure tested prior to shipping;UL-80 certified;Made from ASTM A-1011 steel;NPT female threaded openings;Available in 1/2" bottom outlet;Pressure tested at a minimum of 5 PSIG;For use at atmospheric pressure only