* Patented manual couplers adjust easily to R134a service ports with varying dimensions.
* All metal construction for extra durability.
* Patented, spring loaded depressor will not damage service valves.
* Can be removed from service ports regardless of knob position without losing refrigerant.
* Meets SAE, UL and EPA requirements for containment of refrigerant.
* Color coded.
* A Quality product from Mastercool, USA.