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There are two styles of high-pressure fittings: the SAE with an inverted flare (top photo, left) and the later metric version that requires Saginaw fittings (top photo, right). The good news is that these fittings are interchangeable in the pump housing, since the thread pitch between metric and SAE is close enough not to be an issue. We’ve tried this, and it works. This allows you to use a newer, metric pump but retain your original inverted-flare hoses (that’s a Saginaw fitting in the lower photo).