Mouse over for larger view. (May take a few seconds to display.) Barbed 2662 NC2 1-1/8'' or 29mm Barbed 2664 NC3 1-1/2'' or 38mm Cone Collar 2622 1-1/8'' or 29mm Drop Off 2644 1-1/4'' or 32 mm Drop Off 2652 1-1/8'' or 29mm Drop Off Sideport 2650 3/4'' or 19mm Drop Off Sideport 2653 1-1/4'' or 32mm Large Collar 2730 NM1 1-1/8'' or 29mm Plain 2803 1'' or 25mm Plain 2804 1-1/8'' or 29mm Plain 2806 1-1/2'' or 38mm Plain Sideport 2814 1-1/8'' or 29 mm