Product review (1 stars): 4. Is it legal to sell R-22a for use ...
4.  Is it legal to sell R-22a for use as a refrigerant in air conditioning equipment designed for use with HCFC-22?

No. The CAA and EPAs regulations prohibit the introduction into interstate commerce of substitutes that have not been submitted to EPA for review and listing under 40 CFR 82.176(a).