A steel flange. A steel flange.

Flange: (Noun) a projecting rim or collar on a wheel, pipe, rail, etc., that serves to hold it in place, give it strength, guide it, or attach it to something else.

In a sentence:

Engineer: "Look procurement office, I need more budget for a flange otherwise the restaurant will flood."

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Procurement officer: "I have no budget for flanges, have you read the news lately!"