Product review (5 stars): Great product. I wish they made one for 1/2 in OD copper.
I used to repair a R134 window unit that got a hole in the condenser, after soldering the line I installed one on the low side and one on the high side. I wish they made one for 1/2 in OD copper, but being the inventive guy that I am, I removed the seal and drilled it out, and re-glued the seal back in, then took to my HVAC guy and they evacuated the system and charged it and it has worked ever since.