Thats funny 'cause we buy, as a company R-11 flush kits, to retro fit R-22 systems to R-410a systems. When the linesets cannot be removed. The refer is vented.
I don't understand the thinking in the venting, but that is what it is sold for, cleaning out the contaminants. I guess the stuff is so good, it is excempt from the EPA regis..
You got me?
The refer comes in it's own little can and 1/4" nossle for the hose and presice instructions on how to use it.
Works great for wax, build-up and sludge problems due to moister and burn-outs.

01' TJ Wangler, 6" Ruff Country X Series, 35" x 12.5" Mickey Thompsons On 15 x 10" rims w/ simi Bead Lock, Matching Warn Bumpers, 9500xi Warn Wench, Tom Woods Drive Shaft And SYE, And A K+N Cool Air Intake. Still Improving