Anyone used 421A drop in?

[davegreenlee]

Just saw an ad in an HVAC mag, advertising 421A Drop in for R-22, says its ASHRAE deignated, has no butane, propane or anything in it.
Has anyone used it, What were the results?

[hvac Denny]

hmm. I wouldn't know but grainger or the local hvac supplier might?

[beenthere]

It has a higher GWP then R22.