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I may have used the incorrect term for "Military block heater". If so please excuse me.
It is a heating element ( looks like one from a domestic electric water heater).
The unit fits into the multi fuel engine block water jacket and plugs into 120 V.A.C.
Eastern Surplus www.easternsurplus.net/ part number MA3-600 ( I find them to be a good honest company to deal with.