NU-22B® Replaces R-22, R-407C, R-422D and R-417A. NU-22B is the only R-22 replacement you need.
R-421A is a drop-in replacement for R22 systems. With this refrigerant there is no need to change the oil. Simply recover the R22 and recharge with R421A.Experiencing R421a problems? Read this guide.
R22 Refrigerant, 30lb disposable cylinder. EPA certification required