Within the family, small diameter pipes, but also low pressure, see flange connection.

在家庭内，管道直径小，而且是低压，看不见法兰连接。

youdao

Within the family, small diameter pipes, but also low pressure, see flange connection.

在家庭内，管道直径小，而且是低压，看不见法兰连接。

youdao