Tankless water heater part unknown for repair

Hello, I have a EEMax eem24027 tank-less water heater, and 1 part is broken and I need a replacement, But I don't know the name of the part nor can find any thing on the web by guessing the name or looking at google Images, If anybody knows the name of this part please help me.

Picture link https://prnt.sc/mm26m0

thanks

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