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Cross-section diagram of a metal channel with red pipes, gold, and blue liquids pooling inside, set against a blueprint background.

Cross-section diagram of a metal channel with red pipes, gold, and blue liquids pooling inside, set against a blueprint background.

showing the concept — a cross-section of a box-section crossmember cavity, showing where moisture pools versus where a drain hole or cavity wax would need to reach. This visually explains your actual engineering point (design-for-worst-case vs. coating-adequacy) far better than a photo of a rusty part ever could, and it's fully original, so no copyright concern at all. Mehr sehen