Hello, please give me a moment to gather info for you.
Your part should be: Bosch Aquastar 125B Thermocouple with Flue Gas sensor Part #8707206344
You can find parts for your Bosch unit here: http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/AquaStarModels/125BTechSupport/PartsListPurchaseaPart/tabid/383/Default.aspx
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do you have this or are you just telling me a number that i could have gotten from the bosch site