I used it for the vacuum work of the air conditioner.
On 2017-10-11 15:49:29
Although I always used the one of 90 centimeters, there was a time when the installation position of the pump was inconvenient, but since this was long, the degree of freedom improved. Since it is with a valve, opening the valve with the valve closed eliminates the burden on the vacuum gauge and reduces the risk of breakdown.
Since there is a valve at hand, it is very convenient because you can work more securely as the influence of the residual gas in the hose is reduced when removing the hose from the external machine. I'd also like a product with a length of 180 cm since more altitude work is done.