Comparison : Item # 9864-8, 1/2 Inch Copper Tube Size (CTS) Twist-To-Lock Union Tee Fitting
Item # 9864-12, 3/4 Inch Copper Tube Size (CTS) Twist-To-Lock Union Tee Fitting
Item # 9864-16, 1 Inch Copper Tube Size (CTS) Twist-To-Lock Union Tee Fitting