The Union has been installed in underwater direction wan to check and maintenance in the future and every wan must be installed in a location that is easy to verify, or retire to repair or change it.
Install a union in the water and check valves. For future maintenance And all valves must be installed in a location that is convenient for checking or removed to repair or replace it.
To be installed in the direction of underwater Union and check valve. For maintenance in the future. And ลว์ all need to install in a position convenient to check or withdrawal to repair or change.