This is a drum of R-22 refrigerant. If your A/C is more than 12 years old there is a good chance it has this inside it. The government has made this gas illegal to use and it is extremely high priced. The box advertises and alternative but no alternatives are approved by any manufacture of equipment and may void the UL listing. Please be super cautious when considering using these alternatives. Here at Sam Pollard and Son we do not recommend any of these. We recommend that you consider a new system with an approved refrigerant already inside. Call us today if your unsure of the type refrigerant that is in your HVAC unit. We have technicians who are happy to assist you with any concerns you may have. Call an schedule today or fill out the form below to request an appointment!