1. When selecting the union metal hose, choose a metal hose with a loose sleeve flange at one end as far as possible；
2. Do not twist the union metal hose；
3. The union metal hose should not bend along the root of the metal hose；
4. Mechanical damage to the sealing surface of the flange is strictly prohibited；
5 Install the device based on the correct installation method.
Address: High-Tech Industrial Park, Laoshan,Qingdao China