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;Phosphate washed and oven-dried paint coated;Light color paint finish such that condensation is less likely to occur within the tank;Robust tank leg brackets welded to the tanks. Optional legs are also available.;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 5 PSIG;Operation at atmospheric pressure only;External surface-washed and phosphated;External finish-beige electrostatic powder paint