I've got a couple of Monitor Tops and they still work - so I've never has to find gas or convert.
The Methly Chrolide gas is still used commercially and is available for commercial use only. It also used to be used in making leaded gasoline. Also known as - Monochloromethane, Methyl chloride, Artic, Freon 40, R 40, UN 1063, R10, R40, or R48/20
As far as the Sufur Dioxide does - it's still a common gas but not sold for refrigeration. It was known as R23 or R24.
There are some replacement gasses available - but all require a lot of work to install - e.g. changing the oil, the drier, etc.
Both the old gasses are toxic to a degree - but what isn't?
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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