Kozyvacu Adjustable R134A Adapter Fittings Quick Coupler High Low AC Freon Manifold Gauge Hose Conversion kit, 1/4" SAE HVAC

OPEN and CLOSE directions on top knob are incorrect. OPEN is clockwise , opening port on compressor side of fittings. Both high and low side fittings are labeled incorrectly. Turning the adjustment knob counterclockwise prior to connecting to compressor, allows you to keep the schrader valve closed on the compressor until you turn the adjustment knob clockwise , which opens the schrader on the compressor side, connecting your gauges to the compressor. Labeling implies the OPPOSITE!

I had a gauge set (probably harbor freight) that had the r134 adapters on it. high side worked ok but low side just would not open schrader valve. My old ones looked just like these. I read other reviews of people having problems just like mine that was solved with this set, so I ordered them. Arrived quickly, put them on my gauge set, hooked it up to the RAV4, turned the valve on, and to my relief it worked perfectly. Now I can charge my system properly and troubleshoot the other car properly.Perfect.

I'm a HVAC tech, and I have a standard set of manifold gauges. I'm glad i found this product because i was going to fork out $100 for new automotive manifold guages. They worked flawlessly, and would recommend.

Tried these out the other day, no leaks and easy to use, unscrew knobs before hooking up to system, then open them for proper use. I updated an old R12 gauge set with these and highly recommend them. they fit perfectly to old R12 hose sets. The unit also works well with my old 1989 Lincoln town. Highly recommended.

They were a better replacement than my original valves.

I replaced the original fittings that came with my A/C manifold gauge set as they were pretty cheaply made. The fit and finish on these replacements was very nice and they worked perfectly. I would definitely recommend them.

They worked well but the valves are mislabeled. The high pressure one open/close is backwards. They didn’t leak but they through me for a loop why I had no high pressure. I

The low pressure side would not lock on to the hose as it should, lost freon gas and could not charge my Jeep properly. Had to return and ordered another brand. Likely just a bad one, bad luck.