If you're working on a newer vehicle with R1234YF air conditioning, you know it needs specific oil to keep the compressor happy.
This Enviro-Safe Oil Charge 3 (part #2021A) is exactly that—a lubricant formulated for R1234YF systems, so you can recharge or top off without compatibility issues.

It's a straightforward product from Enviro-Safe Refrigerants, a known name in the AC world.
The 2021A is a single-dose oil charge that you add during the A/C service process.
It helps lubricate the compressor, seals, and other moving parts, extending the life of your system and preventing premature failure.

Just add it alongside your refrigerant charge—simple as that.