Restore Original Cooling: Bring your A/C performance back to its original cold air state. Established Product: This is the original Enviro-Safe Refrigerant introduced over 27 years ago. Equivalent Efficiency: 1 can of Enviro-Safe R134a Replacement refrigerant equals 1lb of R134a. Lower Head Pressure: Operates at lower head pressure for improved efficiency. Improved Cooling: Offers improved cooling properties and performance compared to standard refrigerants. Made in America.