Standard physical dimensions and NPT openings for easy retrofit installation;Two large grip handles on both sides for greater ease of manipulation;The handles are recessed and never in the way;Robust tank leg brackets for greater stability;All tanks are factory pressure tested prior to shippingUL 80 certified;UL 142 certification also available on 275 & 330 US gal (including a 3" diameter emergency vent opening);Made from ASTM A-1011 steel;Pressure tested at 5 PSIG;Operation at atmospheric pressure only;Phosphate washed and oven-dried paint coated;External finish-black or grey electrostatic powder paint