Mastercool E-Z Snap High-Side Quick Coupler features a unique patented design that easily snaps on and off the A/C system’s service ports under pressure. This coupler automatically adjusts to various service port dimensions allowing fast and immediate access into the A/C system. It includes swivel feature that enables flexibility to easily access all service ports even in the tightest quarters. The coupler meets SAE, UL as well as EPA recommendations for containment of refrigerant and is backed by a 1 year warranty on material and workmanship.