Do you want to tighten the two valve caps for the outdoor air conditioner?
Which valve cap do you mean? High and low pressure with two valves, after the normal after-sale installation, are used to open the six corners. As for the two copper nuts, they don't really screw up. But it's better to screw it up.
There is a small leak in the general valve. For a long time, freon will be left out there.It must be tightened
Must be tightened to prevent the valve from leaking.
