The new side entry can tap is like having three tools in one. This unique design will work on all R134a (2-7/8 ), R12 (2-1/2 ) and oil charge (2 ) cans. The outlet port offers a ½ ACME and ½ FL fitting with an internal check valve to prevent system backflow. The pliers style grip is easy to use and has a positive locking latch to insure secure engagement.