Comparison : Item # 302-20-20, 1-1/4 Inch (in) Flange Size SAE Thread to Flange Head - Straight
Item # 302-24-24, 1-1/2 Inch (in) Flange Size SAE Thread to Flange Head - Straight
Item # 302-32-32, 2 Inch (in) Flange Size SAE Thread to Flange Head - Straight
Item # 302-40-40, 2-1/2 Inch (in) Flange Size SAE Thread to Flange Head - Straight
Item # 302-48-48, 3 Inch (in) Flange Size SAE Thread to Flange Head - Straight