Review on 🔌 Efficient R1234yf Quick Couplers: High/Low Side Manual Couplers for A/C Refrigerants Manifold Gauge Set, 1/4" Male Port, Quick Connect Adapters & AC Hose Fitting Connectors Replacement by Charles Collier

Sounds like a big hitch. I can't comment on the durability as I just got it. A little confusing because the meaning of the words "open" and "closed" is different than expensive US made distributor kits. Usually you have to snap the sleeve onto the fitting and then OPEN the valve. But on them you need to put them in the "open" position to snap them into the service port. Its body prevents you from actually pushing the Schrader valve at the wrong moment. So you set them to "open”, snap them into the service port and then "close” them to the refrigerant. flow. Apart from that they are great.