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PLEASE VISIT MY WIFE'S SITE- "TRUCKDEAL"-ALSO! WE'LL BOTH BE SURE YOU'RE IN GREAT HANDS!!
Here is a power rectifier diode, 037-306-B. Reverse polarity. 037-305-B is the number for straight polarity.
NOTE! THE FIRST ONE OF THE ORIGINAL 4 JUST SOLD. THE PICTURE ABOVE IS OF THAT ONE. THE OTHER 3 ARE THE SAME EXACT ONES, EXCEPT THEY SAY "MEXICO" ON THEM, AND DO NOT HAVE 740C MARKED.THEY ARE IDENTICAL IN SPECIFICATIONS!
It came from a Miller welding machine. Functional, dismantled at the salvage company I work for.
Tested, biased in one direction, ship free with the first one!