Comparison : Item # 20HB-20SF, 1.25 Inch (in) Hole Size Hose Barb to SAE Flange Head - Straight
Item # 24HB-24SF, 1.50 Inch (in) Hole Size Hose Barb to SAE Flange Head - Straight
Item # 32HB-32SF, 2.00 Inch (in) Hole Size Hose Barb to SAE Flange Head - Straight
Item # 40HB-40SF, 2.50 Inch (in) Hole Size Hose Barb to SAE Flange Head - Straight
Item # 48HB-48SF, 3.00 Inch (in) Hole Size Hose Barb to SAE Flange Head - Straight