3-in-1 Side Can Tap for R12, R134a & Oil Charge Cans W/dual Port 1/4" SAE & 1/2" Acme 3 in 1 Eliminates the need for 3 separate tools. Replaces Mastercool and Robinair can tap valves Use with R-134a, R-12 and oil charge cans It has a locking latch to insure secure engagement Integrated hinged inserts High impact composite construction for durability