Specification - P3120 - Heavy Duty 12" x 12" Stainless Steel Floor Drain with Solid Cover and Perimeter Drainage MIFAB series P3120 - 12in square heavy duty floor drain constructed of 14 gauge, Type 304 stainless steel body and 1/2in thick Type 304 stainless steel solid cover with perimeter drainage slot. Free area of 8 square inches. Standard with ANSI rated "Heavy Duty" solid Type 304 stainless steel grate with a load rating of 5,000 to 7,500 lbs and no hub bottom outlet.