The Manchester 20lb horizontal tanks are expensive in the sense that they are highly sought after. They are technically exempt since they were built before 1998 and are non OPD valve retrofittable. The valve-cores are replaceable, and the surface rust is easy to clean and prepare a new paint-job.
I was hesitant and looked at replacement tanks, but to be honest the new Manchester tanks don’t work as a direct replacement. The valve moves from the center to the top, and the valve is out at a 90* angle vs a 45* angle downward. It would require a different style of regulator and some more propane line work.
I found a shop online that had replacement valve cores for this model Sherwood valve and decided to go the refurbish route. The valves are counter threaded, and require a torque wrench to get on properly without damaging the brass. I also got a replacement LP regulator, hose, and newer style POL fitting that has a rubber gasket on the end.
I’m in the process of painting the tank, and will need to get it leak tested before i go get it filled with LPG. Im no concerned with the replacement valve stem, im more concerned with the old purge valve since i cannot find a replacement rubber o-ring for the inside of it. I.m sure ill be able to measure and track down something that will work.