Cast Iron Valve Box Riser Usage Fits most existing valve boxes or will fit over standard 6" water pipe for new construction. The protruding side flanges help the valve box lock into concrete or asphalt. The riser comes in five different sizes, however, all use the same lid design. Box and lid sold separately. Item Number / Description 120 1"Cast Iron Riser 121 2"Cast Iron Riser 122 2 1/2"Cast Iron Riser 123 3"Cast Iron Riser 124 4"Cast Iron Riser 125 Cast Iron Riser Lid Item #120-125