CAST IRON VENT COVER/REPAIR PLATE. PLEASE SELECT THE REQUIRED DESIGN FROM THE ABOVE DROP DOWN SELECTION BAR. 5 SQUARE 125 X 125MM. 5 ROUND/CIRCLE 125MM DIAMETER. 6 ROUND/CIRCLE 150MM DIAMTER. 8 ROUND/CIRCLE 200MM DIAMTER. 6 MEDIEVAL GRILL COVER OVERALL 160 x 160mm Inner square 95mm x 95mm Depth 40mm. 8.7 HERITAGE 220 X 220MM. SOUTHWARK PLATE 165MM X 165MM. WESTMINISTER PLATE 235MM X 155MM.