The Weitron R1234YF Refrigerant with Stop Leak 8oz contains Honeywell R1234YF refrigerant and advanced leak seal formula that stops and prevents leaks in your automotive A/C system. Unlike oil, which is a common additive in stop leak products, this advanced formula stops leaks in all A/C components (including compressors, accumulators, O-rings, and hoses), prevents system clogging, and is safe for RRR machines. R1234YF refrigerant is a new refrigerant that is compatible with majority of vehicles manufactured after 2015*. R1234YF has ultra low global warming impact and zero effects on ozone depletion. The 8-ounce-size can is convenient for one-time replenishment and can also be preserved for multiple uses.,* Refrigerant compatibility is determined by model year and automotive manufacturer. Check before installing.