The fuel system offers leak tightness during exigency landing.

Corrugated hoses can withstand high pressure and provide maximum leak tightness on account of their material.

For example BS EN 1779:1999; it applies to assessment of leak tightness by indication or measurement of gas leakage, but excludes hydrostatic, ultrasonic or electromagnetic methods.

Both the manufacturer and the DB were thereby hoping for greatly reduced maintenance costs, with its outstanding (and in 120 004 proven) oil leak tightness, which is also to the benefit of greater environmental protection.

Leak testing is part of the non-destructive test NDT portfolio that can be applied to an art to verify its conformity; depending on material, pressure, leak tightness specifications, different methods can be applied.

Vacuum sewers can pass through water protection areas and areas with sensitive high ground water tables, because there is no danger of spoiling groundwater resources (vacuum sewers have a high leak tightness due to their material; moreover the vacuum itself does not allow exfiltration).