Comparison : Item # 111-821-44, 1/4 Inch O.D. Tube Polypropylene Push-To-Connect Tube to Male NPTF Straight Shut-Off Ball Valve
Item # 111-821-66, 3/8 Inch O.D. Tube Polypropylene Push-To-Connect Tube to Male NPTF Straight Shut-Off Ball Valve