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Whisper 12/15U & 12000/15000U

You are in possession of a Whisper 12/15 Ultra or 12000/15000 Ultra  model , A generator with water-cooled 3-cylinder diesel engine.

Generators made before 2004 are called the 12000/15000 Ultra series , after 2004 the generator were named 12/15 Ultra. To see what type of generator you have you can look for the part- and serial number on your generator.