Product review (5 stars): Hell can finally freeze over
I used this in combination with r134a and the Interdynamics (VA-1L) Retrofit Valve for 7/16" Low Side Port adapter on a GE Profile refrigerator/freezer to refill the refrigerant after being a little overzealous with a heat gun.  It fit snugly on the copper line and doesn't leak at all.  It took me an hour or two to find a good spot to put the fitting and to refill with refrigerant.  It has been a few months now and my freezer continues to function like new and I definitely saved myself a buck or two.

UPDATE:
It has been five months now and I haven't had to do any more maintenance to the refrigerator.  It continues to work as new.