Install Double Check valve
I have to install a double check valve assembly in a 3/4" horizontal copper line. The brass check valve assembly has 3/4" female pipe thread connections.
What is the best way to install this? Should I use a union on each side, or would compression fittings be better. The unit weighs about 5-6 lbs and its overal length is about 6" less than the length of the horizontal copper line that it will be installed in. The check-valve unit has its own service valves on each end.