I ran into a waterlogged expansion tank that has a inlet pipe and a outlet pipe. this is mounted horizontally with the tank on the supply side of the system . hot water comes in on one side and exits on the other. anyone have a idea on the proper way to set up this tank. it does have a bleeder fitting about 2 inches above the pipe level but no way to shut off the water supply and no drain on the bottom.

Thank you. gpost