In gas handling systems, it’s often the smallest components that decide system reliability. High-pressure tube unions may look simple, but their role is critical: ensuring a leak-proof connection under demanding conditions. Cheap or mismatched fittings are a false economy, leading to leaks, contamination, or catastrophic failures. DILO’s metal-to-metal sealing principle has proven itself across industries, from SF₆ handling to hydrogen applications. The lesson is clear: cutting corners on connections undermines entire systems. The big question for operators—are you willing to risk a multimillion-dollar installation to save a few cents on fittings?