Comparison : Item # 9856-8, 1/2 Inch Copper Tube Size (CTS) Twist-To-Lock Test Cap
Item # 9856-12, 3/4 Inch Copper Tube Size (CTS) Twist-To-Lock Test Cap
Item # 9856-16, 1 Inch Copper Tube Size (CTS) Twist-To-Lock Test Cap