Which type of fitting requires precise alignment to ensure a proper seal?

Flare fittings are designed with a specific geometry that necessitates precise alignment to create a proper seal. These fittings utilize a conical flare, typically at a 45-degree angle, which must align perfectly with its counterpart for effective sealing. When the flared end of the tubing is pressed against the fitting, the surfaces must meet evenly and flat to avoid leaks. If the alignment is off, even slightly, it can result in a poor connection and potentially lead to fluid leakage.

In contrast, other fitting types generally have more forgiving designs. Compression fittings, for instance, rely on a compression ring that adapts to slight misalignments. Barbed fittings utilize an interference fit that holds the hose in place without requiring perfect alignment. Screw fittings can adjust to minor misalignments due to the nature of threaded connections. Thus, flare fittings stand out as needing that specific, careful alignment to ensure a secure and leak-free connection.