I have no idea as to the model number but we are using them in our fish room with great success. We even had one that held 2-125 gallon tanks, without bowing. The ones we use now are holding 2-75 gallon tanks on each row, 2 rows per rack and there have been no problems with them. We replaced the particle board that came with them with 3/4 inch plywood and that seemed to do the trick. HTH Susan