R410A R22 Valve Core Remover Installer Tool with Dual Size SAE 1/4 & 5/16 Port for R404A R407C R134A R12 R32 HVAC System, with 10PCS 5v1 Valve Cores and Double Head Valve Core Remover

The plunger is too tight to get through the valve smoothly. As it gets hung up the core does not stay on the end of the plunger. This could result in you having to dump the entire refrigerant charge.

The parts are not very interchangeable so ,hard to use undoing the valve

I tried to use these valves to evacuate a mini-split system. At first I thought the vacuum gauge was not working, but when located directly on the vacuum pump, the vacuum gauge went down to 15 microns and kept the vacuum after I switched off the pump. Then I connected the vacuum gauge to the valve core remover installer valves and took it down to 100 microns. When I switched off the vacuum pump, the pressure instantly went up to 20400 microns.Had I removed the cores and released the refrigerant with these valves, I would have lost the refrigerant.I am now returning these valves and will buy good quality valves such as Master Cool, Javac or Yellow Jacket.

Note that this item will not fit a car AC system! It was not clear on the the original advert!

Great product and excellent quality quality

Does exactly what it should. The ball valve tap is a great improvement over the last one of these I had and I now have the ability to use this on A/C with the 410 adapter.