The Mastercool Manual Low Side Quick Coupler is the perfect tool for any refrigeration technician. This coupler is designed to be easily removed from service ports regardless of knob position without losing refrigerant. It meets SAE UL and EPA requirements for containment of refrigerant and is constructed with all metal for extra durability. With this product, you can be sure that your refrigeration system is in safe hands. FleetPride is your First Click in Heavy Duty®.