Comparison : Item # 40C-SW-28, 4 Inch (in) Nominal Size Standard Wall Iron Pipe Size (IPS) Aboveground Split Anchor Ring
Item # 50C-MW-28, 5 Inch (in) Nominal Size Medium Wall Iron Pipe Size (IPS) Aboveground Split Anchor Ring
Item # 30C-SW-28, 3 Inch (in) Nominal Size Standard Wall Iron Pipe Size (IPS) Aboveground Split Anchor Ring