What is this on the fuel sending unit? 05 LLY

Fitment: ENGINE CODE 2 LLY ONLY,2004.5-2005 Chevy SILVERADO 2500HD,2004.5-2005 GMC SIERRA 2500HD,2006 HUMMER H1 ALPHA Part Number:# 97369850,#

Fuel Pressure Regulator for 04-05 Chevy GMC Duramax LLY Diesel MPROP # 0928400653 97369850

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Fuel Sending Unit (For use with aftermarket lift pumps) for 2005

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Fuel Rail Pressure Sensor - 2004.5-2005 GM 6.6L LLY Duramax RB40281006186

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ACDelco Fuel Sending Unit Kodiak / Topkick Duramax Diesel - MU1539