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It is a coolant heater. Generally that style is called a tank heater - at least in these parts.
As pump guy says it should have a cord on it so you can plug it in to house power. They are invaluable for helping get an engine in very cold weather.
 

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Discussion Starter · #4 ·
Thanks, I’m putting rings in this Perkins and wasn’t sure what it was. My plan is to drop the oil pagan and see if I can pull the piston and connecting rod through the bottom.
 
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